How to have better sperm...

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.