Episode Summary
Executive Summary: This episode examines whether semen retention and No Nut November have real health benefits. The science suggests not ejaculating does not meaningfully raise testosterone or athletic performance, but short abstinence can increase sperm count and volume while too-long abstinence can worsen motility and DNA integrity. The bigger risk may be shame-driven online communities, not ejaculation itself.
Main Topics: Semen retention culture and online claims (Priority: 5/5): The hosts explore the popularity of semen retention on social media, where creators claim not ejaculating boosts energy, confidence, masculinity, and even appearance. Testosterone and “feeling like a beast” (Priority: 5/5): They test the common claim that abstaining from ejaculation raises testosterone and improves mood, energy, and body composition. The evidence does not support a meaningful long-term testosterone boost. Athletic performance and energy (Priority: 4/5): The episode reviews whether avoiding sex or masturbation improves sports performance or daytime energy. Studies generally show no effect, except that very recent sexual activity may cause short-lived fatigue. Sperm quality and fertility (Priority: 5/5): The show compares short-term abstinence versus frequent ejaculation for fertility. Longer abstinence increases sperm quantity, but shorter abstinence tends to improve sperm motility and reduce DNA damage. Prostate cancer and health risks (Priority: 3/5): They address the rumored risk of not ejaculating and the possible protective association between frequent ejaculation and lower prostate cancer risk, while noting the evidence is inconclusive. Psychological effects and online communities (Priority: 4/5): The episode warns that no-fap forums can foster guilt, shame, misogyny, and distress, suggesting the harm may come more from ideology and community dynamics than from masturbation itself.
Key Arguments: Claims that semen retention boosts testosterone are not supported by the stronger evidence; baseline testosterone generally does not change with abstinence. The only apparent testosterone rise in the cited 10-man study occurred after masturbation/orgasm, not during abstinence, which undermines the retention claim. Short-term abstinence can make the eventual orgasm feel more intense due to anticipation and buildup, but that does not prove a health benefit. Most sports-performance studies show no meaningful difference between having sex and abstaining the night before competition. If sex occurs within about two hours of exercise, some participants may feel slightly more fatigued during recovery, likely from the exertion itself. For fertility, abstinence increases sperm count and semen volume, but after several days sperm motility and DNA quality can worsen as sperm age in the epididymis. The practical fertility recommendation is usually 2–5 days of abstinence before the fertile window, with even shorter intervals for some men with high DNA fragmentation. The main danger of semen-retention communities may be psychological: they can intensify shame, worthlessness, and distress around normal sexual behavior.
Data Points: Views on TikTok/Instagram for semen retention content: Over 1 billion - Justin Dubin’s social media review found semen retention vastly outpaced other men’s health topics. Study sample size: 10 men - The testosterone study had men masturbate on day 1 and again on day 21 after 20 days of abstinence. Abstinence period in testosterone study: 20 days - Men abstained from sexual activity between lab measurements. Small Chinese study duration: 1 week - A retracted paper had suggested testosterone rose after a week without ejaculation. Athlete study sample size: 15 male athletes - A study examined sex versus no sex and cycling performance two hours later. Mood study sample size: 44 men - One study compared men who did not masturbate for three weeks with controls. Sperm volume increase per day: ~12% per day - One small study estimated semen volume increased for each day without ejaculation. Suggested fertility abstinence window: 2 to 5 days - Brent Hansen recommended this before the partner’s fertile window for many couples trying to conceive. High DNA fragmentation recommendation: 1 day - For men with significant sperm DNA damage, shorter abstinence was recommended. Forum evidence base: Studies of Reddit/forum diaries - Analyses found some users felt better, but many also experienced shame and distress. Citation count: 71 citations - The episode notes its transcript and claims are heavily sourced.
Pivotal Quotes: "Bro, I became a beast." — Online semen retention creator: Representative claim from semen-retention videos about mental and physical transformation. "Holding your semen does not increase your testosterone levels." — Justin Dubin: Bottom-line conclusion on the testosterone question after reviewing the research. "You don't have to ever ejaculate. I don't really think that's a problem." — Justin Dubin: Reassurance that abstinence itself is not harmful if someone chooses it.
Implications: Listeners should not expect semen retention to boost testosterone or performance, but brief abstinence may help sperm count before conception. The bigger concern is guilt-heavy online communities that pathologize normal sexuality.
About Science Vs
There are a lot of fads, blogs and strong opinions, but then there’s SCIENCE. Science Vs is the show from Spotify Studios that finds out what’s fact, what’s not, and what’s somewhere in between. We do the hard work of sifting through all the science so you don't have to and cover everything from 5G and ADHD, to Fluoride and Fasting Diets.