Andrew Huberman· PhD
However, the more frequent the ejaculation, the lower the concentration of sperm in each ejaculate.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
However, the more frequent the ejaculation, the lower the concentration of sperm in each ejaculate.
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But given that the ejaculate contains sperm of varying ages and therefore varying quality and given that with each successive ejaculation in a short period of time there's going to be a decrease in the concentration of sperm per milliliter of semen, of ejaculate, we can make some good arguments as to how often couples should have intercourse with ejaculation around the time of ovulation if the goal is to fertilize.
if one's goal is to fertilize the egg, you want to take into consideration that most often there is going to be a dramatic decline in the concentration of sperm per ejaculate any time those ejaculations are occurring within a short period of time, say, within 12 to 24 hours of one another.