Wearing looser underpants could be a simple way for men to improve their sperm count and the hormones that control it, a US study suggests.

In a study of 656 men, by researchers at Harvard TH Chan School of Public Health, in the US, boxer short wearers had a 25% higher sperm concentration than men in tight-fitting underwear.

Cooler temperatures around the testicles could be the reason.

Experts say this simple lifestyle change could improve men’s fertility.

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