Men produced higher quality ejaculates when exposed to novel, rather than familiar women, the researchers found. "Additionally, men ejaculated more quickly when viewing a new woman after being exposed to the same woman repeatedly," added the team from the College of Wooster in Ohio.

For the study published in the Journal of Evolutionary Psychological Science, the team asked 21 men to provide semen samples while watching seven different explicit three-minute clips of a male and female having sex.

The findings can help in 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".

"Our findings are the first to demonstrate that men's ejaculate behaviour and composition change in response to novel female stimulus," the authors concluded.


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