Does Masturbation Lower Testosterone? What the Evidence Actually Says

What does the research actually show about masturbation and testosterone?

Several studies have measured testosterone levels before and after ejaculation, including during masturbation. A 2021 randomized controlled pilot study by Isenmann and colleagues found that masturbation may partially counteract the natural circadian drop in free testosterone over the course of a day, but produced no meaningful change in the ratios between total testosterone, free testosterone, and cortisol 1Ref 1Isenmann E, Schumann M, Notbohm HL, Flenker U, Zimmer P (2021).Hormonal response after masturbation in young healthy men – a randomized controlled cross-over pilot study.Masturbation may transiently affect free testosterone concentrations but does not meaningfully alter hormonal ratios; no lasting suppression of testosterone was observed. The authors were explicit that these preliminary findings — from just eight healthy young men — require confirmation in larger trials.

The broader picture across the published literature is consistent: testosterone fluctuates transiently in the hours surrounding sexual activity (some studies report a brief rise at ejaculation, others find no change), but there is no evidence of a sustained suppression from routine masturbation. Baseline testosterone measured the following morning is not altered by the prior night's activity.

Where does the idea that masturbation drains testosterone come from?

Two sources drive most of the online claims.

The first is a small 2003 study that reported a testosterone peak on day seven of abstinence, reaching roughly 145% of baseline 2Ref 2Jiang M, Xin J, Zou Q, Shen JW (2003).A research on the relationship between ejaculation and serum testosterone level in men [RETRACTED].Often cited as evidence for a testosterone surge on day seven of abstinence; retracted in 2021 for duplication of a prior publication; findings have not been independently replicated. That study was later retracted — for overlap with a prior publication by the same authors — and its findings were never replicated in an independent sample. Even before retraction, context mattered: the peak was transient, was observed in only 28 volunteers, and levels returned to baseline with continued abstinence. The framing of this as a 45% permanent testosterone boost from avoiding ejaculation is not supported by the data.

The second source is the lived experience that many people report during abstinence — increased energy, motivation, or confidence. These experiences are real, but testosterone is not a reliable explanation. Improved sleep, reduced anxiety, a stronger sense of self-efficacy, or simple placebo effects are all plausible contributors that have nothing to do with hormone levels. Testosterone is one of many hormones influencing mood and motivation, and the relationship is not linear or simple.

What actually lowers testosterone — and what the evidence supports

If you are concerned about testosterone levels, the factors with genuine, replicated evidence for suppressing them are worth understanding:

Sleep deprivation. This is one of the most direct and modifiable causes. A well-known study by Leproult and Van Cauter found that restricting sleep to five hours a night for one week lowered daytime testosterone in healthy young men by 10–15% 3Ref 3Leproult R, Van Cauter E (2011).Effect of 1 Week of Sleep Restriction on Testosterone Levels in Young Healthy Men.One week of sleep restriction to 5 hours nightly lowered daytime testosterone by 10–15% in healthy young men; sleep deprivation is a well-established modifiable cause of testosterone suppression. Most testosterone production occurs during deep sleep; chronic short sleep meaningfully suppresses the axis that drives testosterone synthesis.

Obesity. Excess body fat — particularly abdominal fat — suppresses the hypothalamic-pituitary-gonadal (HPG) axis and is associated with lower testosterone in men 4Ref 4Ng Tang Fui M, Dupuis P, Grossmann M (2014).Lowered testosterone in male obesity: mechanisms, morbidity and management.Obesity suppresses the hypothalamic-pituitary-gonadal axis and is associated with lower testosterone; adipose tissue aromatase activity converts testosterone to estradiol; substantial weight loss can partially restore testosterone levels. The relationship is bidirectional: low testosterone also promotes fat accumulation. Substantial weight loss can partially restore testosterone levels.

Chronic alcohol use. Heavy and chronic alcohol consumption disrupts the HPG axis at multiple levels — suppressing gonadotropin-releasing hormone in the hypothalamus, reducing luteinizing hormone from the pituitary, and directly impairing testosterone synthesis in the testes 5Ref 5Emanuele MA, Emanuele NV (2001).Alcohol and the Male Reproductive System.Chronic alcohol use disrupts the HPG axis at hypothalamic, pituitary, and testicular levels, suppressing testosterone; mechanisms include beta-endorphin elevation, oxidative stress, and Leydig cell damage. Even moderate regular use may have a modest effect.

Certain medications. Opioids are a well-established cause of testosterone suppression (opioid-induced androgen deficiency), acting primarily by inhibiting GnRH and LH. Long-term systemic corticosteroids, some antipsychotics, and certain antidepressants can also affect testosterone levels.

Underlying medical conditions. Type 2 diabetes, metabolic syndrome, pituitary tumors (including prolactinomas), and primary testicular conditions all can suppress testosterone through distinct mechanisms.

Aging. Testosterone declines gradually in men across the decades, with the prevalence of low testosterone rising substantially with age — from roughly 10% in men aged 50–59 to approximately 70% in men aged 70–80 in some cohort studies 6Ref 6Thirumalai A, Anawalt BD (2022).Epidemiology of Male Hypogonadism.Testosterone deficiency prevalence increases with age, affecting approximately 10% of men aged 50–59 and up to 70% in some cohorts at age 70–80; iatrogenic causes are the most common overall. This is normal physiology, not a disease requiring treatment unless symptoms are present and levels are consistently low.

When is it worth checking your testosterone level?

Low testosterone (hypogonadism) is a clinical diagnosis that requires both symptoms and confirmed low levels on testing — not one or the other alone 7Ref 7Bhasin S, Brito JP, Cunningham GR, Hayes FJ, Hodis HN, Matsumoto AM, Snyder PJ, Swerdloff RS, Wu FC, Yialamas MA (2018).Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline.Diagnosis of hypogonadism requires both symptoms and consistently low fasting morning testosterone; recommends against screening asymptomatic men; morning testing, confirmation with repeat measurement, and individualized treatment decisions. The symptoms that suggest evaluation is worthwhile include:

• Persistent low sex drive that does not reflect relationship or situational factors
• Difficulty with erections, particularly the absence of morning erections
• Unexplained fatigue that does not improve with adequate rest
• Depressed or low mood, particularly when other causes have been excluded
• Reduced muscle mass or unexplained strength loss
• Decreased bone density

These symptoms need to be persistent and not explained by other obvious causes — a rough patch of poor sleep, high stress, or a difficult period in life does not require a testosterone check.

Testing protocol. The Endocrine Society recommends measuring total testosterone in the morning (before 10 a.m.), fasting, using a reliable assay, and confirming any low result with a repeat measurement 7Ref 7Bhasin S, Brito JP, Cunningham GR, Hayes FJ, Hodis HN, Matsumoto AM, Snyder PJ, Swerdloff RS, Wu FC, Yialamas MA (2018).Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline.Diagnosis of hypogonadism requires both symptoms and consistently low fasting morning testosterone; recommends against screening asymptomatic men; morning testing, confirmation with repeat measurement, and individualized treatment decisions. This matters because testosterone follows a clear daily rhythm — concentrations are 20–25% higher at 8 a.m. than at 4 p.m. in younger men 8Ref 8Brambilla DJ, Matsumoto AM, Araujo AB, McKinlay JB (2009).The effect of diurnal variation on clinical measurement of serum testosterone and other sex hormone levels in men.Testosterone concentrations in men aged 30–40 are 20–25% lower at 4 p.m. than at 8 a.m.; afternoon measurements can falsely suggest deficiency; morning testing is essential for accurate diagnosis, and a single afternoon measurement can falsely suggest deficiency.

If testosterone is genuinely low, follow-up tests include LH and FSH (to determine whether the problem is testicular or comes from the pituitary/hypothalamus), prolactin (to screen for a prolactinoma when LH and FSH are unexpectedly low), and a broad panel that includes thyroid function and a metabolic panel — because fatigue and low libido have many causes besides testosterone.

What does testosterone replacement therapy involve?

Testosterone replacement therapy (TRT) is an individualized treatment — it has real benefits for men with confirmed hypogonadism, and real risks that require careful discussion with a clinician. The Endocrine Society guideline recommends therapy only when both symptoms and consistently low testosterone are present, not as treatment for normal aging or as a performance intervention 7Ref 7Bhasin S, Brito JP, Cunningham GR, Hayes FJ, Hodis HN, Matsumoto AM, Snyder PJ, Swerdloff RS, Wu FC, Yialamas MA (2018).Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline.Diagnosis of hypogonadism requires both symptoms and consistently low fasting morning testosterone; recommends against screening asymptomatic men; morning testing, confirmation with repeat measurement, and individualized treatment decisions. Contraindications include active or suspected prostate cancer, elevated PSA without workup, untreated severe sleep apnea, recent cardiovascular events, elevated hematocrit, or plans to conceive (TRT suppresses sperm production).

For most men asking about masturbation and testosterone, TRT is not the relevant question. The relevant questions are lifestyle-based: sleep, weight, alcohol, and stress are all modifiable factors with better-established and less risky impacts on testosterone than any pharmaceutical intervention.