A growing body of medical research indicates that men who ejaculate 21 times or more each month appear to face a lower risk of developing prostate cancer compared with those who report four to seven times. The findings, while attention-grabbing, call for careful interpretation.
The most frequently cited evidence comes from the long-running Health Professionals Follow-Up Study, led by researchers from Harvard University and published in JAMA. It tracked more than 31,000 men over nearly two decades. Those who ejaculated most often had a roughly 31 per cent lower risk of prostate cancer, particularly in cases confined to the prostate.
Australian researchers have observed similar trends, with some suggesting that frequent ejaculation might help clear potentially harmful substances from the prostate or reduce inflammation. Others believe it could simply reflect better overall health among more sexually active men.
Yet experts stress that frequency alone is not a medical prescription. The studies are observational, meaning they identify correlation rather than cause. Men who eat well, exercise, and avoid smoking are also more likely to be sexually active—factors that may all play a role in lower cancer risk.
Doctors continue to advise regular check-ups and discussions about prostate-specific antigen (PSA) testing, particularly for men over 50 or those with family history. Lifestyle measures such as maintaining a healthy weight, moderating alcohol, and staying active remain the cornerstones of prevention.
Prostate cancer remains one of the most commonly diagnosed cancers among Australian men, with around 25,000 new cases each year. While the “21 times” headline may spark curiosity, the broader message is about balance—keeping physical, sexual, and emotional health in step.
Disclaimer: This article is for general informational purposes only. It summarises scientific studies and does not constitute medical advice. Readers should consult a qualified healthcare professional for guidance on prostate health, screening, or treatment options.
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