Looser fitting underpants keep testicles cool, resulting in 25% more sperm being produced
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Lower sperm counts don't mean the reproductive apocalypse — yet - Vox
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Why men trying to conceive should wear boxers and sleep naked
Wearing loose-fitting boxers could boost sperm count
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Wearing boxer shorts boosts sperm count, scientists say
How Men's Underwear Can Affect Sperm Quality: Dispelling the Myth
Lower sperm counts don't mean the reproductive apocalypse — yet - Vox