Oxford Study: More Frequent Ejaculation May Boost Sperm Count & Fertility

New research from the University of Oxford suggests that regular ejaculation may lead to higher quality sperm, challenging long-standing guidance regarding abstinence before fertility testing. The study, published on March 25, 2026, indicates that sperm stored within the reproductive tract deteriorates over time, a finding that could influence how fertility clinics advise patients.

Current guidelines from the World Health Organization (WHO) typically recommend that men abstain from ejaculation for two to seven days before providing semen samples for assisted reproduction or testing. This advice was primarily designed to maximize sperm count. However, the new analysis suggests that while abstinence may increase the volume of sperm, it may compromise the quality of the cells available for fertilization.

Study Findings on Sperm Quality

The research team conducted a extensive meta-analysis to reach their conclusions. The investigation combined data from 115 human studies involving 54,889 men. The researchers reviewed 56 studies across 30 non-human species to identify shared biological patterns. The findings revealed a process known as post-meiotic sperm senescence, where mature sperm in storage generally deteriorate in quality independently of the male’s age.

According to the study, longer periods of sexual abstinence were associated with increased sperm DNA damage and oxidative stress. The data also showed reduced sperm motility, which refers to the ability of sperm to swim effectively, and lower viability. Dr. Krish Sanghvi, a biologist at the University of Oxford and lead author on the study, noted the significance of these results.

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.

Dr. Krish Sanghvi, University of Oxford

Biological Mechanisms of Deterioration

The research highlights specific biological reasons why stored sperm loses quality. Unlike most cells, sperm are highly active but have a limited capacity to replenish their energy reserves. When sperm remain in storage during periods of abstinence, they are subject to energy depletion. Oxidative stress, described by researchers as a form of biological rust, accumulates in the sperm and can cause physical damage to the cells.

This deterioration occurs regardless of the age of the male. While male fertility is known to decline with age, the study clarifies that the time sperm spends in storage contributes to this decline separately. The findings imply that a man’s age is not necessarily the same as the age of his sperm, as sperm are produced continuously from puberty onwards but can age while waiting in the reproductive tract.

Implications for Fertility Treatment

The study has direct implications for fertility clinics and IVF treatments. If the goal is to obtain the best quality sperm rather than just the highest count, the standard recommendation for several days of abstinence may need to be reconsidered. The research suggests that if doctors want to collect the best quality sperm, men should probably not abstain from ejaculating for several days as current guidelines suggest.

Senior author Dr. Irem Sepil, also from Oxford, emphasized the role of reproductive fluids in this process. She noted that organs often secrete reproductive fluids to nourish sperm and support sperm viability. The deterioration observed suggests that without regular ejaculation, these stored cells are not maintained in optimal condition for fertilization success and embryo quality.

Expert Perspective on Frequency

While the study provides new insights for those actively trying to conceive, health experts caution against overinterpreting the data for general wellness. Dr. Megha Pancholi, Sexual Health Lead at Boots Online Doctor, explained that there is no single ideal masturbation frequency for the general population. She stated that habits vary hugely from person to person.

What matters most is whether it feels comfortable and isn’t causing any distress or interfering with daily life.

Dr. Megha Pancholi, Boots Online Doctor

Dr. Pancholi noted that for most people, a wide range of habits can fall within what is considered healthy. Frequency may change over time due to everyday stress, relationships, or hormone levels. These shifts are not usually a cause for concern unless they are sudden or causing distress. There is no strong evidence that ejaculating frequently harms sperm health or overall wellbeing for those not undergoing fertility treatment.

Lifestyle Factors and Fertility

Medical professionals emphasize that ejaculation frequency is just one component of reproductive health. Dr. Pancholi insisted that overall health and lifestyle are far more important for fertility than masturbation frequency. Sperm quality is influenced by many other factors including age, smoking, alcohol intake, weight, and overall health.

For men who are actively trying to conceive, avoiding very long gaps between ejaculations may be beneficial based on the Oxford findings. However, outside of fertility settings, there is no need to change normal habits. Men who have concerns about fertility or sexual function are advised to speak to a healthcare professional to get personalized advice, and reassurance.

Some men may experience concerns around timing, such as premature ejaculation, which is very common and treatable. If such issues are affecting confidence or relationships, confidential support and treatment options are available through medical services. The new Oxford study adds nuance to the understanding of male reproduction, suggesting that regular ejaculation whether through sexual activity or masturbation results in higher quality sperm with less DNA damage.