HoldsUp

The Diary Of A CEO · 2026-04-27 · Steven Bartlett (host), Rena Malik

Sex Expert: What Women Actually Need To Enjoy Sex

81 research-tied claims examined: 3 contradicted 5 overstated 14 context 49 supported 10 unverified

49

Supported by research

0:00:12Rena Maliksupportedvery low

Consuming 100 grams of pistachios daily improves erectile dysfunction in men.

"So, they actually did a study on pistachios where guys ate 100 g of pistachios every day and they saw a decrease in erectile dysfunction" (said at 0:00:12)

A 2011 prospective study evaluated 17 married male patients with erectile dysfunction (ED) who consumed 100 g of pistachios daily for 3 weeks. The study reported a statistically significant improvement in International Index of Erectile Function (IIEF-15) scores (from 36.0 ± 7.5 to 54.2 ± 4.9) and penile color Doppler ultrasound parameters, alongside improvements in serum lipid profiles. However, the evidence certainty is very low because it is based on a single, small, uncontrolled pre-post study with only 17 participants.

0:00:18Rena Maliksupportedmoderate

A lack of regular erections leads to reduced blood flow and progressive shrinkage of penile or clitoral tissue over time.

"because if you're not having erections now, you're no longer getting blood flow to your penis and it will shrink over time. And the same goes for women with their clitoris because it's the same type of tissue." (said at 0:00:18)

Physiologic and clinical research shows that regular erections (both spontaneous nocturnal erections and provoked erections) supply oxygenated blood to cavernous erectile tissue. Absence of regular erections—such as following nerve injury or prolonged erectile disuse—leads to chronic tissue hypoxia, apoptosis, cavernous smooth muscle degeneration, progressive fibrosis, and subsequent penile structural changes including loss of length and volume (atrophy). The pathophysiologic rationale applies to erectile tissues of both the penis and clitoris, which share homologous anatomical structures and reliance on neurovascular blood flow for tissue maintenance.

0:06:22Rena Maliksupportedmoderate

Survey data shows that roughly 60% of college-aged women and 20% of college-aged men have been choked during sex, and 20% of those choked have experienced it 25 or more times.

"So young people, if you look at data, like 60% of women and I think 20% of men have been choked during sex of that age group, like college age group. And of those people who get choked, 20% have been choked 25 times or more." (said at 0:06:22)

The speaker's figures closely reflect findings from large campus probability surveys of undergraduate students investigating rough sex and sexual choking/strangulation (notably research led by Debby Herbenick and colleagues). In probability-based campus survey data of nearly 5,000 undergraduate students, choking/strangulation during sex was reported as a common partnered behavior, with roughly 47% to nearly 60% of sexually experienced undergraduate women and around 20% of men reporting having been choked, and a notable subset reporting high-frequency repeated exposure. Because these estimates are derived from cross-sectional self-report surveys, the certainty is rated as moderate.

0:10:25Rena Maliksupportedhigh

Achieving an erection physiologically requires entering a parasympathetic nervous system state.

"Basically, when you get aroused, you need to be in a parasympathetic nervous system state. So in order to get an erection, you need to be in this state which is like rest and digest." (said at 0:10:25)

Classic autonomic neurophysiology establishes that penile erection is mediated by the activation of sacral parasympathetic pathways, which stimulate cavernosal vasodilation and smooth muscle relaxation, whereas sympathetic nervous system activity is anti-erectile and maintains detumescence.

  • supports: Neural control of erection. (Physiology & behavior 2004) · cited 239x in the literature
    "Penile erection is a vascular event controlled by the autonomic nervous system. The spinal cord contains the autonomic preganglionic neurons that innervate the penile erectile tissue and the pudendal motoneurons that innervate the perineal striated muscles. Sympathetic pathways are anti-erectile, sacral parasympathetic pathways are pro-erectile, and contraction of the perineal striated muscles upon activity of the pudendal nerves improves penile rigidity." (abstract, passage verified)
    pubmedfull study (doi)
  • supports: [Neural control of erection]. (Journal de la Societe de biologie 2004) · cited 6x in the literature
    "Activation of sacral parasympathetic pathways elicits penile erection through the release of vasorelaxant neurotransmitters that increase blood flow to the penis and relax the penile erectile tissue. Sympathetic pathways are antierectile." (abstract, passage verified)
    pubmed
0:18:55Rena Maliksupportedlow

In the Health Professionals Follow-up Study of 20,000 men, adherence to a Mediterranean diet was associated with a 22% lower risk of erectile dysfunction.

"There's a study called the Health Professionals Follow-up Study. They looked at 20,000 men, and they saw that men who adhered to a Mediterranean diet had a 22% lower risk of erectile dysfunction." (said at 0:18:55)

A prospective cohort analysis from the Health Professionals Follow-up Study (n = 21,469 men) evaluated the relationship between dietary patterns and incident erectile dysfunction over a median follow-up of 10.8 years. Adherence to a Mediterranean diet was associated with a lower risk of erectile dysfunction, with the highest adherence category associated with a 22% lower risk among men under 60 years of age (HR 0.78, 95% CI 0.66–0.92) compared to the lowest adherence category. Higher adherence was also associated with reduced risk in men aged 60 to <70 years (HR 0.82) and men aged ≥70 years (HR 0.93).

0:20:05Rena Maliksupportedmoderate

Dietary fiber is converted by gut microbiota into short-chain fatty acids that exert protective effects on blood vessel endothelium.

"When you eat fiber, in your gut it converts to short-chain fatty acids. These short-chain fatty acids then sort of have these endothelial-protective mechanisms. They protect the blood vessels. They make them healthier." (said at 0:20:05)

The speaker's claim accurately reflects well-established gut-vascular physiology. Dietary fiber is fermented by gut microbiota into short-chain fatty acids (SCFAs), primarily acetate, propionate, and butyrate. Once absorbed into the circulation, SCFAs act on free fatty acid receptors (such as FFAR2/FFAR3) and inhibit histone deacetylases, leading to reduced vascular inflammation, decreased oxidative stress, improved nitric oxide signaling, and enhanced endothelial function and vascular integrity.

0:20:43Steven Bartlett (host)supportedhigh

The daily recommended intake for dietary fiber is 38 grams for men and 25 grams for women.

"So I think making sure that you meet the criteria for fiber, which is 38 grams for men, 25 grams for women, is really, really important." (said at 0:20:43)

Standard nutritional guidelines (such as the Dietary Reference Intakes established by the Institute of Medicine and USDA Dietary Guidelines) recommend an Adequate Intake of dietary fiber of 38 grams per day for men and 25 grams per day for women aged 19 to 50 years (based on approximately 14 grams per 1,000 kcal). For adults over age 50, the recommended intake is slightly lower (30 g/day for men and 21 g/day for women).

0:32:36Rena Maliksupportedmoderate

Young males experience nocturnal erections three to five times per night, lasting up to 40 minutes each.

"So, when you're a young boy, you get actually like erections three to five times a night, and they can last up to 40 minutes long. So you can spend a lot of your night with an erection." (said at 0:32:36)

Published physiological and urological data on nocturnal penile tumescence (NPT) demonstrate that healthy young males typically experience between 3 and 5 sleep-related erectile episodes per night, closely aligned with REM sleep cycles, with individual episodes lasting up to 30–45 minutes. Observational monitoring studies in young, potent men show multiple distinct episodes per night (averaging roughly 4 to 5 episodes per recording session), with normal potent status defined by erectile episodes maintaining rigidity for substantial durations during the night.

0:34:37Rena Maliksupportedhigh

Testosterone is produced nocturnally and peaks in the morning.

"Overnight your body is making more testosterone. That's when your body sort of has nocturnal testosterone production. And so it's highest in the morning, which is why often you get a morning erection." (said at 0:34:37)

Testosterone secretion follows a well-established circadian rhythm in men, with secretion increasing overnight during sleep and circulating levels peaking in the early morning (typically between 07:00 and 08:00) before declining to a nadir in the late afternoon and evening. Because of this morning peak, clinical practice guidelines routinely mandate morning blood sampling for diagnosing androgen deficiency.

0:36:10Rena Maliksupportedmoderate

Prolonged absence of regular blood flow to penile or clitoral erectile tissue causes fibrosis and penile shrinkage over time.

"And so if there's no healthy fresh blood getting to the penis on a regular basis, either through nighttime erections or through sex with your partner, then you will get fibrosis of these tissues. That means you get a little scar in the tissues and then over time you might see some shrinkage of the penis." (said at 0:36:10)

Urological and sexual medicine literature supports that spontaneous nocturnal erections and regular sexual tumescence provide cyclic oxygenation to the cavernosal erectile tissue. In the prolonged absence of these erections (such as following radical pelvic surgery or severe neurovascular impairment), chronic cavernosal hypoxia leads to smooth muscle apoptosis, increased collagen deposition (fibrosis/scarring), loss of tissue elasticity, and reduced stretched penile length over time.

0:39:46Rena Maliksupportedhigh

Skene's glands are the female anatomical homologue of the male prostate.

"also there's the Skene's glands, which are these glands that sit underneath the urethra, and they're the homologue of the male prostate." (said at 0:39:46)

Skene's glands (paraurethral glands) are the established female developmental and anatomical homologue of the male prostate gland. Anatomical, histological, and immunohistochemical studies demonstrate shared morphological features, common embryological origins from the urogenital sinus, and shared biomarkers such as prostate-specific antigen (PSA) and prostatic acid phosphatase (PAP). In modern anatomical terminology and urological literature, the periurethral glandular complex is frequently referred to as the female prostate.

0:40:35Rena Maliksupportedmoderate

During orgasm, dopamine is released and is followed by an increase in prolactin.

"Well, so when you think about what happens during an orgasm is you have this release of dopamine and then your prolactin goes up and sort of like everything calms down." (said at 0:40:35)

Human and animal physiological studies consistently confirm that sexual arousal and orgasm involve central dopaminergic activity, followed by a marked, transient surge in prolactin release immediately post-orgasm. This post-orgasmic prolactin increase acts as part of a negative feedback mechanism on central dopaminergic pathways, contributing to post-orgasmic sexual satiety and the refractory period.

0:41:43Rena Maliksupportedmoderate

Chronic elevation of cortisol dampens testosterone production.

"If you are chronically stressed, that means your cortisol is raised all the time, which is dampening your testosterone" (said at 0:41:43)

Endocrine and physiological literature firmly establishes that sustained hypercortisolemia suppresses the hypothalamic-pituitary-gonadal (HPG) axis. Glucocorticoids exert inhibitory effects across multiple levels of the HPG axis, suppressing hypothalamic GnRH release, pituitary gonadotropin secretion (LH and FSH), and directly inhibiting steroidogenesis within testicular Leydig cells. Clinical studies in patients with sustained cortisol excess (such as Cushing's syndrome or autonomous cortisol secretion) show high rates of secondary hypogonadism and suppressed testosterone that reverse following normalization of cortisol levels.

0:43:38Rena Maliksupportedmoderate

Restricting sleep to 5 hours a night for one week reduces testosterone levels in men by 15%.

"They looked at data on men sleeping 5 hours a night versus 8 hours a night. So you take the same guy and he sleeps 8 hours, then you, you know, do 5 hours for a few days—for a week, his testosterone drops by 15%." (said at 0:43:38)

A widely cited controlled study by Leproult and Van Cauter (JAMA, 2011; PMID: 21632481) evaluated the effect of 1 week of sleep restriction (5 hours per night in bed following 3 nights of baseline 10-hour bed rest) in 10 healthy young men. The researchers found that daytime testosterone levels decreased by 10% to 15% after 1 week of sleep restriction compared with the rested baseline state. The guest's description accurately reflects the design, duration, and magnitude reported in this landmark study, though the certainty is moderate due to the small sample size (n=10) and specific demographic (young, healthy men).

0:44:50Rena Maliksupportedmoderate

A neck circumference greater than 17 inches for men or 16 inches for women is associated with a high likelihood of obstructive sleep apnea.

"If it's more than 17 inches for a guy or 16 inches for a female, it means it's very likely that you may have sleep apnea." (said at 0:44:50)

In clinical sleep medicine, neck circumference is an established anthropometric screening metric for obstructive sleep apnea (OSA). A neck circumference greater than 17 inches (43 cm) in men or 16 inches (40-41 cm) in women is the standard high-risk cutoff utilized in validated clinical screening tools (most notably the STOP-Bang questionnaire) and clinical guidelines to denote a substantially increased risk of OSA.

0:45:50Rena Maliksupportedmoderate

Phthalates and BPA found in plastic bottles mimic estrogen and can decrease testosterone production.

"So plastic water bottles have things like phthalates and BPAs which can affect hormonal health. They can mimic estrogen. They can reduce the production of testosterone based on these mechanisms." (said at 0:45:50)

Bisphenol A (BPA) and various phthalates are well-characterized endocrine-disrupting chemicals. BPA acts as a synthetic estrogen (xenoestrogen) and, along with anti-androgenic phthalate metabolites, has been shown in human in vitro and animal models to disrupt Leydig cell steroidogenesis and suppress testosterone production. For example, experimental organotypic culture of human fetal testes demonstrated that BPA concentrations as low as 10 nM significantly reduced testosterone secretion. While standard single-use water bottles are primarily composed of polyethylene terephthalate (PET) rather than BPA-based polycarbonate, the mechanistic assertions regarding BPA and phthalates exhibiting estrogenic activity and reducing testosterone production are supported by published toxicological literature.

0:46:19Rena Maliksupportedmoderate

Heating or warming plastic bottles increases the release of microplastics and chemical compounds into water.

"If you have to drink out of plastic because you're at an event or whatever, try to make sure it's not a warm bottle. So, it hasn't been like sitting in the sun for hours and hours and hours because as it gets warm, it releases more microplastics and more chemicals into the water." (said at 0:46:19)

Heating plastic water bottles or exposing them to sunlight significantly accelerates both the release of microplastics/nanoplastics and the leaching of chemical additives (such as phthalates and bisphenols) into the drinking water. Laboratory analyses of polyethylene terephthalate (PET) bottles under simulated outdoor and in-vehicle storage conditions show marked increases in plastic particle counts and chemical concentrations following thermal and solar exposure due to surface photothermal degradation.

0:59:51Rena Maliksupportedmoderate

The coital alignment technique (CAT) involves a continuous rocking motion maintaining pubic contact over the clitoris during intercourse, which increases female orgasm rates.

"There's actually like this this technique called the coital alignment technique where you sort of move in a rocking a sort of a rocking motion so that your pubic symphysis, so this bone right here, is sort of like rubbing against their clitoris, like this area the skin here is rubbing against the clitoris while you're penetrating and that has been shown to increase orgasm rate and pleasure in sex." (said at 0:59:51)

Published studies support the claim. The coital alignment technique (CAT), originally described by Eichel and colleagues, combines a modified missionary position ('riding high') with coordinated rhythmic rocking movements to maintain constant direct pressure and friction from the male pubic area onto the clitoris during penetration. Controlled trials and comparative studies have demonstrated that instruction in CAT significantly increases the consistency of female coital orgasms, orgasm intensity, and reported sexual satisfaction compared to control conditions or alternative techniques.

0:51:58Rena Maliksupportedlow

Couples who watch pornography together report higher levels of relationship satisfaction.

"We see that when couples watch porn together, they are more likely to be more satisfied in their relationship." (said at 0:51:58)

Observational research examining dyadic patterns of pornography consumption demonstrates that couples who consume pornography together report higher relationship and sexual satisfaction compared to those who do not or those who engage exclusively in solitary use. In multiple cross-sectional and longitudinal samples of heterosexual couples, shared pornography viewing was consistently and positively associated with relationship satisfaction across genders.

0:52:43Rena Maliksupportedmoderate

The male post-ejaculatory refractory period ranges from minutes in younger men up to approximately 36 hours (a day and a half) in older men.

"there's a refractory period after you ejaculate. Now, when you're younger, that refractory period could be minutes. And when you're older, that can be a day and a half." (said at 0:52:43)

In human sexual physiology, the male post-ejaculatory refractory period (the recovery interval required before another erection and ejaculation can occur) is well documented to increase significantly with age. In young, healthy males, physiological studies demonstrate that the refractory time under erotic stimulation can be as short as a few minutes (for example, approximately 10.8 minutes under placebo conditions in laboratory trials), whereas in older males, the refractory period typically lengthens to several hours or up to 24 to 48 hours (1 to 2 days).

0:42:10Rena Maliksupportedmoderate

Hugging a partner for at least 20 seconds helps alleviate stress and interrupt the physiological stress response.

"There's some evidence, you know, the Gottmans have been on your podcast doing a 20-second hug. So standing with your partner or loved one and hugging for 20 seconds on your own like independent gravity actually helps alleviate stress and break sort of a stress loop." (said at 0:42:10)

Published experimental trials support the claim that brief warm physical touch and short embraces (including 20-second hugging protocols) buffer physiological stress reactivity. In a controlled laboratory study of cohabiting couples (PMID: 15206831), a 10-minute warm contact period ending in a 20-second partner hug significantly attenuated blood pressure and heart rate increases in response to an acute public speaking stressor compared to resting controls. Similarly, another trial examining brief partner embraces prior to acute stress (PMID: 35584124) found significantly reduced salivary cortisol responses, although this endocrine-buffering effect was observed primarily in women.

0:59:45Rena Maliksupportedlow

The female-on-top coital position is associated with higher rates of female orgasm during intercourse.

"So, typically when the female partner is on top, she has more control over where she's getting stimulation to the clitoris because, right, she can angle her body in such a way. So, often time that shows that has higher orgasm rates." (said at 0:59:45)

Cross-sectional survey research supports the claim that the female-on-top (woman-above) coital position is positively associated with higher female orgasm consistency during penile-vaginal intercourse. In a large population-based study of 9,813 women, the frequency of use of face-to-face female-above positions was statistically significantly associated with a higher likelihood of achieving orgasm during intercourse, although observed effect sizes were modest. A study evaluating sexual dysfunction also found significantly higher orgasm subscale scores for the female-on-top position.

1:00:52Rena Maliksupportedmoderate

Approximately 40% of women experience squirting during orgasm.

"So about 40% of women squirt. Squirting is the emission of fluid at the time of orgasm." (said at 1:00:52)

The figure matches findings from a nationally representative probability survey of adult women in the United States (PMID 37606312), which found that exactly 40% reported having experienced vaginal squirting at least once in their lifetime. Across broader survey literature, reported lifetime prevalence ranges between 10% and 58%. The study also noted that while squirting frequently occurs alongside sexual climax, only about 20% of women who squirt report that it always occurs concurrently with orgasm.

1:01:12Rena Maliksupportedhigh

Skene's glands are the embryological and anatomical homologue of the male prostate.

"Those Skene's glands are the homologue of the male prostate and they have a little bit of fluid in them, too." (said at 1:01:12)

Anatomical, histological, and embryological evidence confirms that Skene's glands (female paraurethral glands) are the developmental and anatomical homologues of the male prostate. These glands produce periurethral secretions containing prostate-specific antigen (PSA) and prostatic acid phosphatase (PSAP).

1:01:47Rena Maliksupportedlow

Studies administering dye into the bladder of women who squirt demonstrate that the squirted fluid comes from the bladder.

"So, one is they put dye into the bladder and they took women who said they were squirters and they had them orgasm and they saw is there dye in the in the fluid, and yeah, there was dye in fluid. So, it's coming—it has to come from the bladder." (said at 1:01:47)

A 2022 experimental study (Miyagawa et al.) investigated five women who reported the ability to squirt by instilling a solution containing indigo carmine blue dye directly into their bladders via catheter following sexual stimulation. In all five participants, the expelled fluid was dyed blue, confirming that the squirted fluid originated from the bladder. Prior ultrasound studies (Salama et al., 2015) also demonstrated that the bladder fills during sexual arousal and empties during squirting.

1:03:46Rena Maliksupportedmoderate

Skene's glands emit prostate-specific antigen (PSA).

"So one, the reason they emit PSA is because Skene's glands are the homologue of the prostate. So the prostate makes PSA, which is prostate-specific antigen." (said at 1:03:46)

Anatomical, histological, and biochemical studies confirm that Skene's glands (the paraurethral glands, considered the female homologue of the prostate) express and secrete prostate-specific antigen (PSA). Analyses of female ejaculate demonstrate that fluid originating from these glands contains high concentrations of PSA, distinguishing it from other sexual fluids and urine.

1:04:10Rena Maliksupportedmoderate

Post-coital UTIs in women result from sexual thrusting mechanically pushing external bacteria into the bladder through the short female urethra.

"And it's it's not because of the ejaculate or because of the male harboring some bacteria. It's because of the actual thrusting of the penis. It's taking bacteria from the outside and making it more easy for it to go through the urethra into the bladder. And women have a short urethra." (said at 1:04:10)

The speaker's description accurately reflects the standard anatomical and pathophysiological consensus regarding post-coital urinary tract infections (UTIs) in women. Sexual intercourse is well-established as a primary risk factor for uncomplicated recurrent cystitis in premenopausal women. The underlying mechanism involves mechanical massage/thrusting during intercourse facilitating the ascent of periurethral/perineal microbiota through the shorter female urethra into the bladder, rather than infection being primarily transmitted as a sexually transmitted bacterial pathogen carried in seminal fluid.

1:07:10Rena Maliksupportedlow

A study of 19 couples showed that caressing at 3 cm per second produces significantly greater sexual arousal and pleasantness than caressing at 18 cm per second due to C-tactile afferents.

"And so there was a study where they took 19 couples, a small study, it was out of London, and they basically told them to stimulate an erogenous zone and a non-erogenous zone—the non-erogenous zone being the forehead. And so they had the couples stimulated. And they told them stimulated at levels of 18 cm/s uh in terms of how fast you're caressing the arm or or body part and at 3 cm per second. And what they found was those who stimulated at 3 cm per second had more sexual arousal, had more pleasant stimulation compared to those who were stimulating at 18 cm per second." (said at 1:07:10)

A 2018 study conducted at University College London evaluated 19 romantic couples to test the effects of C-tactile (CT) optimal stroking velocity (3 cm/s) versus CT-suboptimal velocity (18 cm/s) applied to an erogenous zone (neck) and a non-erogenous zone (forehead). The study found that CT-optimal velocity (3 cm/s) produced significantly higher ratings of pleasantness and sexual arousal compared to 18 cm/s stroking.

  • supports: Dissociable sources of erogeneity in social touch: Imagining and perceiving C-Tactile opti… (PloS one 2018) · cited 20x in the literature
    "In a first experiment, we randomly assigned "Giver" and "Receiver" roles within 19 romantic couples (20 females, 18 males, age 32.34 ± 8.71SD years) and asked the "Giver" to apply CT-optimal (3 cm/s) vs. CT-suboptimal (18 cm/s) touch on an erogenous (neck) vs. non-erogenous zone (forehead) of their partner. We then obtained ratings of pleasantness and sexual arousal from both "Receivers" and "Givers". ... While both erogenous body part and CT-optimal, sensual touch were found to increase pleasant and erotic sensations, the results showed a lack of an interaction." (abstract, results, passage verified)
    pubmedfull study (doi)
1:09:00Steven Bartlett (host)supportedmoderate

Testosterone prescriptions in the United States increased by 300% over a 10-year period.

"I was reading that there's been a 300% increase in the United States in the last 10 years of testosterone prescriptions." (said at 1:09:00)

Observational cohort studies tracking healthcare claims data in the United States have documented a dramatic rise in testosterone prescribing over a 10-year period (most notably between 2000/2001 and 2011). Analyses of national insurance claims show that testosterone testing and prescription initiation grew pronouncedly over the decade (increasing more than threefold, or >300%), driven largely by the introduction and marketing of transdermal gel formulations.

1:09:21Rena Maliksupportedmoderate

Average male testosterone levels declined by approximately 25% between the late 1990s (around 600 ng/dL) and 2015 (around 450 ng/dL).

"So when you look at testosterone levels from the 1990s, like late 1990s, the average level was around 600, and if you look at data around 2015, it was 450. So there's been like a 25% decline in testosterone." (said at 1:09:21)

The speaker's specific numbers and percentage drop closely match published population data. In an analysis of the National Health and Nutrition Examination Survey (NHANES) cycles between 1999 and 2016 (Lokeshwar et al., 2021), mean total testosterone in adolescent and young adult males (aged 15–39) dropped from approximately 605 ng/dL in 1999–2000 to 451 ng/dL in 2015–2016, representing an approximate 25% decrease. Similar age-independent population declines in testosterone across recent decades have also been observed in other large cohorts, such as the Massachusetts Male Aging Study and large health provider registries.

1:09:42Rena Maliksupportedhigh

Aromatase in adipose tissue converts testosterone into estrogen, lowering circulating testosterone levels in obesity.

"Testosterone has aromatase, and testosterone converts to estrogen using this enzyme called aromatase. And so when you have more fat mass, you have more aromatase, and more testosterone is being converted to estrogen. And so now you have less testosterone." (said at 1:09:42)

The speaker's statement accurately describes a well-established endocrine pathway. Aromatase is the cytochrome P450 enzyme responsible for converting androgens (such as testosterone) into estrogens (such as estradiol). In individuals with increased adiposity or obesity, elevated adipose tissue mass leads to higher total aromatase expression and activity, increasing peripheral conversion of testosterone to estrogen and contributing to lower circulating testosterone levels.

1:17:52Rena Maliksupportedmoderate

Testosterone levels in men decline by an average of about 1% per year with age.

"It does. So it drops about 1% a year on average. Some people drop less, some people drop more." (said at 1:17:52)

Epidemiological and endocrine literature demonstrates that serum testosterone levels in adult men decline longitudinally at an average rate of approximately 1% per year after early adulthood (typically beginning around age 30–40), with substantial inter-individual variability driven by baseline health, body mass index, and comorbid conditions.

1:19:36Rena Maliksupportedhigh

Approximately 45% of testosterone is bound to SHBG, while 1% to 2% is free testosterone.

"So 45% of testosterone is bound to SHBG, which is a molecule of protein that really tightly binds to testosterone. Doesn't let it go for your body to use. Then there's some that's bound to albumin, which is sort of loosely bound, and then there's 2% that's free, 1 to 2% that's free" (said at 1:19:36)

The speaker's statement accurately reflects the established physiological distribution of circulating testosterone in men. In healthy adult males, approximately 43%–45% of circulating testosterone is tightly bound to sex hormone-binding globulin (SHBG), about 50%–55% is bound loosely to albumin, and roughly 1%–2% exists as unbound (free) testosterone.

1:25:04Rena Maliksupportedmoderate

Lower sperm concentrations and poorer semen parameters are dose-dependently associated with higher all-cause mortality and younger age at death.

"We've seen that people who have poor semen parameters, they have higher rates of mortality and they actually live—when you look at age, like what age people die, they die younger compared to people—and it's dose-dependent. So if you have like normal the concentration of sperm and then it keeps going down and down and down, if you look at the age it's like they live to 78, 77, 76, like you can actually see it come down" (said at 1:25:04)

Large-scale cohort studies and meta-analyses support the claim. In a nationwide Danish cohort study of 78,284 men followed for up to 50 years (PMID 40037905), life expectancy was 80.3 years in men with high total motile sperm counts (>120 million) compared to 77.6 years in men with severely reduced counts (>0–5 million). All evaluated semen parameters (including sperm concentration, motility, morphology, and total motile count) showed statistically significant, dose-dependent associations with all-cause mortality (p-trend < 0.001), which persisted after controlling for educational attainment and pre-existing medical conditions. A systematic review and meta-analysis of male infertility cohorts (PMID 33819517) similarly confirmed that mortality risk rises with increasing severity of semen impairment.

1:30:10Rena Maliksupportedhigh

The average erect human penis length is between 5.3 and 5.5 inches.

"and the average penis is about 5.3 to 5.5 inches erect." (said at 1:30:10)

Systematic reviews and meta-analyses of professionally measured penile dimensions confirm that the average erect penis length is approximately 5.2 to 5.5 inches (13.1 to 13.9 cm). A 2015 systematic review of up to 15,521 men by Veale et al. calculated a mean erect length of 13.12 cm (~5.17 inches) and a stretched flaccid length of 13.24 cm (~5.21 inches). A subsequent 2023 systematic review and meta-analysis of 75 studies by Belladelli et al. including 55,761 men reported a pooled mean erect length of 13.93 cm (~5.48 inches; 95% CI: 13.20–14.65 cm, or 5.20–5.77 inches).

1:12:05Rena Maliksupportedmoderate

Longer androgen receptor CAG repeat lengths are associated with decreased androgen receptor sensitivity to testosterone, requiring higher testosterone levels for the same effect.

"the CAG repeats, which are these DNA repeats on the receptor themselves. People who have more are less sensitive to the testosterone that's around, so they need more testosterone to get the same result, whereas people who have less repeats have more sensitivity, so they don't need as much testosterone." (said at 1:12:05)

The androgen receptor (AR) gene contains a polymorphic CAG repeat tract in exon 1 encoding a polyglutamine sequence. In vitro and observational clinical studies show an inverse relationship between CAG repeat length and AR transactivation activity: shorter repeat tracts confer increased androgen sensitivity, whereas longer CAG repeat tracts reduce receptor sensitivity, meaning individuals with longer repeats generally require higher circulating testosterone levels to achieve equivalent androgenic signaling and symptomatic response.

1:24:40Rena Maliksupportedhigh

Following testosterone replacement therapy cessation, recovery of sperm count and fertility can take up to two years.

"And it can come back for the large majority of people, but how long it takes depends on your age and how long you were on testosterone replacement therapy. And in some cases, it can take as long as two years to come back." (said at 1:24:40)

A large integrated analysis of individual participant data from 30 prospective studies (1,549 men) investigating androgen-induced suppression of spermatogenesis found that the overwhelming majority of men recover sperm production after cessation. The probability of returning to normal fertile concentrations (≥20 million/mL) was 67% at 6 months, 90% at 12 months, 96% at 16 months, and 100% within 24 months (two years). Multivariable time-to-event analysis and clinical studies confirm that the timeline for recovery is significantly influenced by treatment duration and age.

1:30:19Rena Maliksupportedlow

Studies evaluating female partner preferences report an average desired erect penis length of approximately 6 inches.

"when you look at like what do women want, they will say on average they want a 6-inch penis." (said at 1:30:19)

Studies assessing female preferences for erect penis dimensions using physical models have found that women on average prefer an erect penis length of approximately 6.3 to 6.4 inches (16.0 to 16.3 cm), depending on relationship context (long-term vs. one-time partner). This aligns with the speaker's statement, though evidence comes from laboratory-based cross-sectional studies with relatively small sample sizes.

1:30:53Rena Maliksupportedmoderate

Average erect penis length is between 5.2 and 5.5 inches depending on the study.

"5.2 to 5.5 depending on the study you're looking at. Yeah." (said at 1:30:53)

A systematic review and meta-analysis of penile dimensions across up to 15,521 men found a mean erect penile length of 13.12 cm (5.17 inches) and a mean flaccid stretched length (often used as a proxy for erect length) of 13.24 cm (5.21 inches). Across individual included studies, mean erect/stretched lengths typically range between approximately 13 and 14 cm (5.1 to 5.5 inches), directly supporting the stated range.

1:31:03Rena Maliksupportedmoderate

Men commonly believe the average penis size is six to seven inches.

"Oh, they think it's like six or seven inches." (said at 1:31:03)

The literature on male perceptions of penile dimensions indicates that men commonly overestimate average erect penis size, frequently believing it to be 6 inches or greater (around 6 to 7 inches), whereas actual measured averages are between 5.1 and 5.5 inches (13.0 to 14.0 cm). A review on average erect penis size specifically notes: "Most men believe that the average length of an erect penis is greater than 6 inches (15.24 cm)" (Veale et al., 2021). Literature syntheses consistently confirm that men tend to perceive above-average penile lengths as typical/normal, leading to widespread inflation of perceived norms.

1:31:50Rena Maliksupportedmoderate

Penile lengthening surgeries have very high complication rates.

"there's not a lot of surgeons who do a lot of penile lengthening surgeries and they have lots of complications, like very high rates of complications because the penis is a very vascular organ." (said at 1:31:50)

Systematic reviews of aesthetic and reconstructive penile lengthening surgeries confirm high complication rates across various techniques, with studies reporting complication rates up to 50%. Complications commonly include paradoxical penile shortening, wound breakdown, infection, tissue necrosis, loss of sensation, and penile deformity, leading surgical societies to view cosmetic penile lengthening procedures as highly controversial with unacceptably high risk profiles.

1:33:20Rena Maliksupportedmoderate

Using a penile traction device for 30 minutes twice daily over 3 to 6 months increases length by approximately two centimeters.

"30 minutes twice a day, and there's like a whole protocol on their website, and it does show improvements in length about two centimeters... Over about 3 to 6 months depending, yeah." (said at 1:33:20)

The claim accurately reflects clinical trial outcomes for modern penile traction therapy (specifically the RestoreX device protocol, which employs daily traction sessions of 30 to 90 minutes, often split into 30 minutes twice daily). In randomized controlled trials and follow-up studies of men with Peyronie's disease or post-prostatectomy penile length loss, daily traction for 3 to 6 months resulted in statistically significant mean increases in stretched penile length ranging from 1.5 to 2.2 cm.

1:33:50Rena Maliksupportedmoderate

Penile traction devices can help straighten penile curvature caused by Peyronie's disease.

"if you have a curvature in the penis like you develop something called Peyronie's disease, this device can actually curve a little bit away from—if you like let's say you have an indentation on the top of the penis, it can actually bend away from that and it can help straighten out the penis." (said at 1:33:50)

Published randomized clinical trials and systematic reviews demonstrate that penile traction therapy (PTT) devices significantly reduce penile curvature in men with Peyronie's disease. A 2023 systematic review and meta-analysis of five studies (419 patients) found a statistically significant reduction in penile curvature degree (p = 0.0373) following penile traction device use. Furthermore, a randomized controlled trial assessing a traction device utilizing counter-bending mechanisms (RestoreX) showed a mean curvature reduction of 11.7° compared to controls (p < 0.01), with 77% of treated participants experiencing measurable improvement in curvature.

1:35:00Rena Maliksupportedlow

Jelqing can cause micro-tears in the penis leading to erectile dysfunction.

"What is dangerous is when people try to do something that became popular on TikTok called jelqing... And this can be dangerous because you can create micro-tears in the penis. And we in the urology community have seen plenty of patients who have now developed erectile dysfunction after doing jelqing because they've now created damage to their penis." (said at 1:35:00)

Published urological literature recognizes manual penile traction and milking techniques (such as jelqing) as potential causes of penile trauma and neurovascular injury, which can lead to erectile dysfunction and conditions such as hard-flaccid syndrome (HFS). Systematic reviews and clinical case series note that traumatic or repetitive manual stress to the penis triggers neurovascular damage, inflammatory responses, and pelvic floor dysfunction that frequently present with erectile dysfunction and sensory loss. However, evidence is derived primarily from case reports, patient cohorts, and observational reviews rather than controlled trials.

1:38:56Rena Maliksupportedmoderate

Only about 15% of women achieve orgasm through vaginal penetration alone.

"In fact, only about 15% of women orgasm through penetration alone. They need clitoral stimulation to achieve climax." (said at 1:38:56)

Survey and observational studies on female sexual response consistently show that only a minority of women (typically estimated between 15% and 25%) reliably reach orgasm through vaginal intercourse alone without concurrent clitoral stimulation. The majority of women require or substantially benefit from direct or additional clitoral stimulation to achieve orgasm.

1:41:14Rena Maliksupportedmoderate

There is no scientific evidence that hand or foot size correlates with penile length.

"there's actually no evidence that big hands, big feet correlate to penile size." (said at 1:41:14)

Multiple prospective and cross-sectional studies evaluating potential anthropometric predictors of penile dimensions have found no statistically significant or meaningful correlation between foot/shoe size or general hand dimensions and penile length. A prospective investigation of 104 men found no association between UK shoe size and stretched penile length. Similarly, a multicenter study of 800 men evaluating various physical measurements found low or no correlation between foot length and flaccid or stretched penile length.

1:41:18Rena Maliksupportedlow

A study in a Japanese male population found a correlation between nose length and penile length.

"There's one study in Japan where they looked at nose length. And so the longer your nose is from the the bridge down to the tip, that is potent—at least the Japanese population that they studied was correlated with the length of the penis." (said at 1:41:18)

A 2021 study published in Basic and Clinical Andrology examined post-mortem measurements in 126 Japanese male cadavers aged 30 to 50 years. The authors found that stretched penile length was significantly correlated with nose size (r = 0.564, p < 0.0001), second only to flaccid penile length. Because this evidence comes from a single cross-sectional observational study, the overall certainty of the finding is low.

1:42:58Rena Maliksupportedmoderate

GLP-1 receptor agonists reduce desire in reward pathways, with emerging evidence showing decreased cravings for addictive behaviors such as gambling, shopping, alcohol, and smoking.

"Now the other part of it is Ozempic works on the brain and it works on the reward pathway... There's emerging data that we're seeing people on these medications, these GLP-1s, have less desire for, let's say, gambling, let's say shopping, let's say, you know, alcohol, smoking, whatever it is, right?" (said at 1:42:58)

The speaker accurately characterizes the state of the literature: glucagon-like peptide-1 (GLP-1) receptor agonists modulate central dopamine reward pathways, and emerging preclinical, observational, and early-phase clinical data suggest potential reductions in cravings and intake for substances and reward-driven addictive behaviors such as alcohol, nicotine, and other impulse behaviors. Systematic reviews and cohort studies show signals of reduced incidence and desire for addictive behaviors, though formal randomized controlled trial evidence remains preliminary and mixed regarding long-term cessation outcomes.

1:52:16Rena Maliksupportedmoderate

Approximately 60% of women and 20% of men report having fantasies of sexual submission.

"So, for example, um being sexually submissive is very common. So women fantasize about it like around 60%, men are like 20%, having this desire of sex, this fantasy of sexual submission." (said at 1:52:16)

Published population and cross-sectional surveys on sexual fantasy themes corroborate that fantasies of sexual submission or being sexually dominated are common in the general adult population, reported by a majority of women (often 50% to over 60%) and a substantial minority of men (typically around 20% to 30%). In large-scale survey research characterizing the prevalence of sexual fantasies (e.g., Joyal et al., 2015), submissive themes met criteria for common fantasies, and being sexually dominated ranked among the most prevalent non-normative fantasies among women.

Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.