Wearing boxer shorts boosts sperm count, scientists say, Men's health

Looser fitting underpants keep testicles cool, resulting in 25% more sperm being produced

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Boxers or briefs? Loose-fitting underwear may benefit sperm production

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Sperm Counts Among Western Men Have Halved in Last 40 Years - Study - Men's Health - The Guardian, PDF, Infertility

New research found men who wear boxer shorts have higher sperm

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What Healthy Sperm Should Look Like - Signs of Healthy Sperm

Boxers or briefs? Men's underwear choice could affect sperm count