Men Who Have Casual Sex Have Stronger Sperm and Faster Orgasms, Study Finds

New research shows that men produce more sperm during sexual encounters with new women.

In a study conducted by The College of Wooster in Ohio and published in the Journal of Evolutionary Psychological Science, the quantity, movement and structure of men’s sperm was found to improve in response to “novel female stimulus.”

For their study, the researchers asked 21 sexually healthy straight men to provide seven ejaculate samples over the course of 15 days while watching seven different explicit three-minute clips of a male and female having sex. The participants used the same private room to produce the semen with 48 to 72-hour breaks between each session.

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The first of the six clips used the same male and female actor, while the seventh clip used the same male actor but involved a different female.

While the researchers found no change in the men’s sperm between their first and sixth viewings of the six clips featuring the same female, they found that the men produced healthier, higher volume sperm in a shorter amount of time when exposed to the seventh clip featuring a distinctly different looking female.

The researchers theorized that men produce higher quality sperm when having sex with a new female as the result of the evolutionary drive to better ensure their sperm wins out in producing children over the new female’s likely previous partners. The sperm quality stays the same for a man already in sexual contact with a given female, meanwhile, because, in the eyes of evolution, she is likely to have already been impregnated by that man. The researchers write:

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“An increase in the total number of motile sperm may result in higher likelihood of fertilisation and greater ability to compete with other male’s sperm, whereas a decrease in the time to ejaculation may decrease the likelihood of an extra-pair copulation (with a partner that is not your own) being detected.”

According to the researchers, their study could impact fertility treatments since “ejaculate samples used to test for infertility are often collected with the use of images depicting women other than the man’s partner,” which means male infertility may be under-reported.

 

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