So watching group sex improves sperm quality. Funny things, testicles.
Actually, the headline is probably more attention grabbing than accurate. The article points out that sperm motility increases by a marginal fraction, but volume significantly decreases. Overall, I would have thought the guys watching just a woman were going to end up more fertile.
But now - I see the version of this story on news@nature seems to contradict the decrease in volume aspect in New Scientist. Seems even science journalists have trouble getting the story straight.
Incidentally I wonder what would happen if you tested this on gay men. Would be funny if their sperm also subconsciously adjusted to naked women.
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