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Keeping the balls cool

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Based on prior knowledge that testicle temperatures have to be cooler for optimal production and lifespan of sperm, I heard that marine mammals do not have a scrotum and keep their balls in their bodies. How do they keep their balls cool? Can the same mechanisms work on land if such a mechanism evolved too later on?


One sex joke made by a my friend who studies bio-chem was that if men kept their balls to themselves, there would be less incidents like the below.


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