Researchers are reexamining long-held assumptions about how ejaculation frequency affects sperm health. For years, advice around male fertility has ranged from dietary changes to limiting sexual activity, but much of it has been based more on speculation than strong scientific evidence.

Trends like No Nut November promote the idea that avoiding ejaculation boosts testosterone or improves fertility. However, medical experts generally dispute these claims, and some findings suggest that prolonged abstinence may contribute more to stress or low mood than to measurable physical benefits.

Recent research points in a different direction. A large review conducted by University of Oxford analyzed 115 studies involving nearly 55,000 men and found that extended periods without ejaculation were associated with declines in key sperm quality markers, including reduced motility, lower survival rates, and increased DNA damage.

One explanation is that sperm stored for long periods may begin to deteriorate naturally. Allowing too much time between ejaculations could therefore work against those aiming to support fertility, as older sperm may become less functional over time.

In contrast, more regular ejaculation—whether through sexual activity or masturbation—may help maintain healthier sperm by clearing out older cells and allowing newer ones to develop. Some studies, including long-term research from Harvard University, also suggest a link between frequent ejaculation and a lower risk of prostate cancer, supporting the idea that moderation and consistency may benefit reproductive health.