Scientists investigating human sperm competition stumble upon an intriguing paradox
www.psypost.org
Men who suspect their female partners have more male friends produce ejaculates with higher sperm concentration—yet paradoxically, those who believe in their partner’s faithfulness generate sperm that move faster.
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The original was posted on /r/science by /u/mvea on 2025-02-16 11:01:14+00:00.

Original Title: Men who thought their partner was more likely to spend time with other men produced ejaculates with higher sperm concentration during intercourse. This suggests that men’s bodies could be biologically (but unconsciously) tuned to respond to perceived competition.