Why do the testes need to have a lower temperature than the rest of the
body?
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Why do the testes need to have a lower temperature than the rest of the
body?
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Sperm production is at its best when the testicles are several degrees cooler than your body temperature. That's why they hang outside the body in the scrotum (the pouch of skin that contains the testicles and a network of blood vessels and nerves).