Sperm: "The More, the Better" Isn't True? The Overlooked Factor in Conception Lies with Men - New Insights on Sperm Quality and Ejaculation Frequency

"Is 'The More You Save, the Better' Really True?"

There is a long-held "common sense" belief regarding male fertility: that it is advantageous to abstain for a few days to accumulate sperm in accordance with ovulation or semen collection days. In fact, the World Health Organization (WHO) semen analysis manual states that semen should be collected after a period of a minimum of 2 days and a maximum of 7 days of abstinence. However, new research is challenging this premise, suggesting that the longer sperm remain in the body, the more their quality may deteriorate.

The starting point of this discussion is a meta-analysis published in March 2026 by a research team from Oxford University and others. It analyzed 115 human studies involving 54,889 participants, as well as 56 studies on 30 animal species. The results showed a tendency for sperm stored for longer periods in males to exhibit increased DNA damage and oxidative stress, with reduced motility and viability. The research team explains this as post-meiotic sperm senescence, or aging that occurs after sperm are produced.

Why does this happen? Researchers believe it is because sperm are cells specialized for "movement." While sperm are highly active, they have little cytoplasm and limited capacity for damage repair. Therefore, the longer they are stored, the more susceptible they become to energy depletion and oxidative damage. In other words, sperm are not suited for "long-term storage." It might be more advantageous to use newer sperm rather than holding onto older ones.

Is the WHO Recommendation "Wrong"?

It is important to note that the WHO's 2-7 day recommendation has not been immediately refuted. The WHO manual serves as a practical standard for conducting standardized semen analysis. Abstaining for a few days can result in higher semen volume and sperm count, making it easier to compare test values. Recent observational studies have shown that while short abstinence can be detrimental to semen volume, sperm concentration, and total motile sperm count, long abstinence can negatively affect motility and DNA fragmentation index. Thus, the issue is not "long abstinence or short abstinence," but rather what should be prioritized in each situation.

In semen analysis, the ability to compare with international standards is crucial. However, in the context of IVF or ICSI, fresher and less damaged sperm may be prioritized over simple "numbers." The Guardian reports that while the 2-7 day rule is meaningful at the diagnostic stage, the importance of "saving" sperm is relatively lower in actual IVF treatment, according to experts. The old rules and new findings may seem to clash, but they are actually aiming for slightly different goals.

Ejaculation Within 48 Hours Showed Differences in Pregnancy Rates

The discussion gained real-world relevance with a prospective randomized controlled trial from China, published at the end of 2025. This study analyzed 453 couples undergoing IVF, comparing a group that ejaculated within 48 hours before semen collection with a group that abstained for 48 hours to 7 days as usual. The results showed clinical pregnancy rates of 54.4% versus 44.9% and ongoing pregnancy rates of 46.0% versus 35.7%, favoring the short abstinence group. While it is important to note that this was a single-center study, it suggests that "the longer you abstain, the higher the success rate" cannot be definitively stated.

These figures were also introduced in a WELT article as "about 54% versus about 45%." Despite being a short article that can be read in about three minutes, it succinctly demonstrated that the intuitive belief of "the more you save, the better" is not necessarily scientific. The topic gained attention because its impact was very clear. Information about male fertility has often been based on vague empirical rules, so when clear numbers emerge, it spreads quickly.

The Reality of Male Infertility Is No Laughing Matter

The essence of this study is not simply about "producing a lot." In the world of sperm, quantity and quality often trade off. Longer abstinence can increase semen volume and sperm count, but older sperm are more likely to be mixed in. Conversely, shorter abstinence may be disadvantageous in terms of quantity but advantageous in terms of motility and DNA integrity. What is needed for successful conception is not merely "a lot," but sperm that can reach fertilization and withstand embryo development.

This perspective is crucial in societies where the responsibility for fertility often leans towards women. While much is said about women's age and egg quality, men also have an adjustable factor: "storage time." Of course, there are many other factors related to male infertility, such as smoking, obesity, heat, lack of sleep, stress, and underlying conditions. However, the relatively easy-to-change condition of how one spends time before semen collection can influence the outcome, making it an unmissable point for those involved.

Animal Studies Teach Us About "Bodies Suited for Storage" and "Those That Are Not"

This study is also intriguing because it looks at not only humans but the entire animal kingdom. Sperm can be stored not only in the male's body but also in the female's body after mating. The study suggests that many species have mechanisms for the female to preserve sperm longer. WELT cites bats and some reptiles as examples, where females protect sperm for extended periods. The Oxford University explanation touches on the possibility that female reproductive organs protect sperm with secretions containing antioxidants. Human male organs may not be as proficient as "long-term sperm storage" facilities.

Social Media Reactions Polarized Between "Jokes" and "Sharing Experiences"

When this topic spread on social media, what stood out were, predictably, jokes and memes. On Reddit's science threads in the English-speaking world, there were light-hearted comments like "Finally, science is backing me up" and "No need to be told twice," along with summaries like "quality over quantity." Due to the nature of the theme, it tends to lean towards humor. However, there were also serious responses in the comments section, with links to research papers, indicating that it wasn't just a consumption of crude jokes.

Even more interesting is how the IVF and male infertility communities perceived it. On Reddit's IVF threads, there were multiple accounts of being instructed to ejaculate daily or every other day before egg retrieval, or even 12-24 hours prior. However, there were also warnings that if sperm count is significantly low, the opposite advice might be given. Thus, while the topic spreads as a joke on social media, it is already being utilized as quite practical knowledge in the field. This study seems to have provided material to support that "field sense."

What Is the Real Message to Be Received?

The conclusion to be drawn from this study is simple but should not be crudely simplified. "The longer you abstain, the better" may be a myth. However, "frequent ejaculation is advantageous for everyone" is not necessarily true either. Whether it is for semen analysis for diagnosis, timing methods for natural conception, or IVF or ICSI, the indicators to prioritize will differ. For those with low sperm count, DNA fragmentation issues, or constraints on semen collection timing, the optimal solution will also vary.

Nevertheless, the value of this study lies in demonstrating that "male fertility is not a black box." Not only lifestyle habits but also specific actions like the abstinence period before semen collection can influence the results. The female body is not the only battleground for fertility. Sperm also have freshness, and they deteriorate if stored too long. This seemingly obvious but overlooked fact is finally starting to be widely shared. Topics that appear to be jokes may actually reflect updates in medical science.

Source URL

The main WELT article. A concise German report that served as the starting point for this topic, briefly introducing the study overview, WHO's traditional recommendations, and the higher pregnancy rates in the Chinese study with semen collection within 48 hours.
https://www.welt.de/gesundheit/article69c24e1a8f5761671715d6b3/gesundes-sperma-forscher-raten-maennern-zu-regelmaessigem-ejakulieren.html

Oxford University announcement. Referenced to confirm the core content of the meta-analysis, which involved 115 human studies with 54,889 participants, 56 animal studies with 30 species, and findings of increased DNA damage and oxidative stress, and decreased motility and viability with longer abstinence.
https://www.ox.ac.uk/news/2026-03-25-new-study-finds-stored-sperm-deteriorates-across-animal-kingdom

DOI page of the related research paper. The original paper "Sperm storage causes sperm senescence in human and non-human animals," which was central to the WELT article.
https://doi.org/10.1098/rspb.2025.3181

WHO Semen Analysis Manual, 6th Edition. Used to confirm the current standard that semen collection should occur after a minimum of 2 days and a maximum of 7 days of ejaculatory abstinence.
https://www.who.int/publications/i/item/9789240030787

WHO Manual PDF. Used to verify the text stating "minimum of 2 days and a maximum of 7 days of ejaculatory abstinence" as a condition for semen collection.
https://mes-global.com/wp-content/uploads/2023/09/WHO-6th-Edition-Manual-for-Semen-Analysis.pdf

Preprint of the Chinese prospective randomized controlled trial. Used to confirm the figures showing that the group with ejaculation within 48 hours had a clinical pregnancy rate of 54.4% and an ongoing pregnancy rate of 46.0%, higher than the longer abstinence group in 453 c-IVF cases.
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5821645

Frontiers observational study. Referenced to explain the "balance of quantity and quality," showing that both too short and too long abstinence periods can be disadvantageous depending on the indicators observed.
https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2025.1472333/full

The Conversation article published in The Independent. A general explanation by the study's authors, referenced to explain the mechanism of sperm deterioration and the concept of a "use-by date."
https://www.independent.co.uk/life-style/health-and-families/sperm-fertility-masturbation-ejaculation-abstinence-b2945483.html

The Guardian article. Referenced to confirm expert comments that WHO recommendations are mainly standards for ensuring "numbers," while "fresher and healthier sperm" are emphasized in IVF.
https://www.theguardian.com/society/2026/mar/25/more-frequent-ejaculations-men-fertility-research

Reddit r/science thread. Referenced to confirm social media reactions during the spread of the research, including jokes, memes, and the perception of "quality over quantity."
https://www.reddit.com/r/science/comments/1s357pp/encouraging_men_to_have_more_frequent/

Reddit r/IVF thread. Referenced to confirm firsthand accounts of being advised to ejaculate daily or every other day before egg retrieval, and the caution shared that if sperm count is very low, the opposite advice may be given.
https://www.reddit.com/r/IVF/comments/1m7oojz/ejaculation_guidance_prior_to_er/