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Men With Beards More Likely to ‘Have Smaller Testicles Than Those Without’

According to a new study male primates only have the energy to grow a lot of hair or big testicles, not both. Researchers studied over 100 male primates, including humans, and studied the size of their testicles, the found that those with longer hair or beards had smaller testicles, some as small as peppercorns.

Other primates with shorter hair or with little to no hair had testicles that grew as large in diameter as tennis balls.