A comprehensive study led by University of Oxford researchers suggests that frequent ejaculation improves sperm quality by preventing “post-meiotic sperm senescence,” a process where stored sperm rapidly deteriorates regardless of the male’s age
A groundbreaking meta-analysis led by researchers at the University of Oxford has revealed that regular ejaculation—whether through sexual activity or masturbation—significantly improves sperm quality by reducing DNA damage and oxidative stress. The study, published in Proceedings of the Royal Society B on March 25, 2026, examined data from 115 human studies involving 54,889 men, alongside 56 studies across 30 non-human species. The findings indicate that mature sperm stored in the body undergoes a rapid aging process known as “post-meiotic sperm senescence,” which occurs independently of the male’s overall age. According to the research team, the longer sperm remains idle in the reproductive tract, the more it loses motility and viability, ultimately diminishing its performance during fertilization.
The research directly challenges long-standing World Health Organization (WHO) guidelines, which typically recommend that men abstain from ejaculation for two to seven days before providing a semen sample for fertility testing or IVF. While longer abstinence periods generally lead to a higher total sperm count, the Oxford team found that this “quantity over quality” approach may be counterproductive. “Because sperm are highly mobile and have minimal cytoplasm, they quickly exhaust their stored energy reserves and have limited capacity for repair. This makes storage particularly damaging compared to other types of cells,” explained co-lead author Dr. Rebecca Dean. The study suggests that for procedures like IVF, where quality is paramount, the current seven-day upper limit for abstinence may be far too long.
Beyond human fertility, the cross-species analysis uncovered a striking biological divide: while sperm deteriorates quickly when stored in males, many females have evolved specialized organs that provide antioxidants to preserve sperm health for longer durations. Lead author Dr. Krish Sanghvi emphasized that ejaculates should be viewed as “populations of individual sperm which undergo birth, death, ageing and selective mortality.” By demonstrating that frequent clearance of older sperm via ejaculation allows for a “small but meaningful boost” to fertility, the study provides a new lens for understanding reproductive evolution. These insights are expected to influence clinical protocols in fertility clinics and enhance captive breeding programs for endangered species worldwide.
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