Frequent Ejaculation Linked to Improved Sperm Quality in Men
Encouraging men to have more frequent ejaculations could significantly enhance their fertility, according to a comprehensive new study. Researchers have discovered that sperm tends to deteriorate over time while stored in the body, with longer periods of abstinence correlating with increased DNA damage and oxidative stress in sperm cells.
Research Findings on Sperm Deterioration
The study, led by Dr Krish Sanghvi, a biologist at the University of Oxford, involved a meta-analysis combining 115 human studies with nearly 55,000 participants and 56 studies on 30 non-human species. In both humans and animals, sperm quality declined the longer it remained in males, regardless of age. The research found that as men went without sex for extended periods, their sperm showed more signs of being less viable and poorer swimmers, with notable biological impacts.
Dr Sanghvi stated, "In men, the negative effects we found on sperm DNA damage and oxidative damage were large-ish, so we are confident that this is a biologically meaningful and important effect." The findings, published in Proceedings of the Royal Society B, suggest that current fertility clinic guidelines may need revision.
Implications for Fertility Treatment Guidelines
The World Health Organization currently recommends men abstain from ejaculating for two to seven days before providing sperm for fertility tests or IVF procedures. However, these guidelines were designed to maximise sperm count rather than prioritise quality. Dr Sanghvi emphasised, "All we recommend is that clinicians and couples reconsider whether long abstinence is always good, because abstinence leads to deterioration in sperm quality."
A recent clinical trial involving 453 couples supports this view, showing a pregnancy rate of 46% when men abstained for less than 48 hours before IVF, compared to only 36% for those following the WHO recommendations. This indicates that for assisted reproductive technologies like IVF, having fresher, healthier sperm may be more critical than sheer quantity.
Expert Opinions and Recommendations
Professor Allan Pacey, an andrology expert at the University of Manchester, commented, "There has been growing evidence in recent years that a shorter abstinence time might be beneficial when undergoing assisted reproduction such as IVF. This is because with a short abstinence time the sperm are fresher, more motile and have lower levels of DNA damage." He noted that while abstinence rules are important for diagnostic semen analysis to ensure consistency, they are less crucial during actual IVF treatments.
For couples trying to conceive naturally, the study suggests striking a balance between sperm quantity and quality. Dr Sanghvi advised, "For couples, our recommendation would be that longer abstinence is not always a good thing, and that a balance between quantity and quality needs to be struck." This nuanced approach could help optimise fertility outcomes by avoiding both excessive damage from prolonged storage and insufficient maturity from too frequent ejaculation.
