A large long-term study published in 2016 examined a possible connection between ejaculation frequency and prostate cancer risk, adding nuance to ongoing discussions about men’s prostate health.

Prostate cancer remains one of the most common cancers among men. According to the American Cancer Society, about one in eight men will be diagnosed with prostate cancer during their lifetime, and tens of thousands die from the disease each year in the United States. Risk increases with age, with roughly 60 percent of diagnoses occurring in men over 65. Rates are also higher among African American men and Caribbean men of African ancestry.

Researchers have long explored lifestyle factors that might influence prostate cancer risk, including diet, physical activity, and hormonal influences. One area of interest has been ejaculation frequency.

A study published in European Urology followed nearly 32,000 men over an 18-year period, from 1992 to 2010. Participants periodically reported their ejaculation frequency across different stages of adulthood.

The researchers observed that men who reported higher ejaculation frequency—defined in the study as 21 or more times per month—had a lower likelihood of being diagnosed with prostate cancer compared with men who reported lower frequency (four to seven times per month). The difference amounted to roughly a 20 percent reduction in relative risk, particularly for low-risk forms of the disease.

The authors emphasized that the study identified an association, not a guarantee of protection. They noted that men with higher ejaculation frequency were less likely to be diagnosed later in life, but the findings do not establish a direct cause-and-effect relationship.

Dr. Anne Calvaresi, chair of the Prostate Health Committee at the Urology Care Foundation, described the research as some of the strongest evidence to date suggesting a potential protective role, while still acknowledging that the biological mechanisms are not fully understood.

One hypothesis is that ejaculation may help clear substances from the prostate and seminal fluid that could otherwise accumulate over time. However, researchers stress that prostate cancer is influenced by many factors, including genetics, age, race, and overall health.

Symptoms to be aware of

Early prostate cancer often causes no symptoms, but when signs do appear, they may include:

• Blood in urine or semen

• Increased frequency of urination

• Difficulty starting or stopping urination

• Waking frequently at night to urinate

More advanced disease may present with:

• Urinary leakage

• Back or bone pain

• Erectile difficulties

• Persistent fatigue

• Unintended weight loss

• Weakness in the arms or legs

Health experts emphasize that no single behavior can eliminate prostate cancer risk. Regular medical checkups, awareness of symptoms, and discussions with a healthcare professional—especially for men in higher-risk groups—remain the most reliable approach to early detection and prevention.

The study adds an important piece to the broader picture of prostate health, but it does not replace medical guidance or screening decisions made with a doctor.