In general, heat is not good for biological tissues. One of the major causes of lowered sperm count and overall reduced sperm quality that's quite common is the presence of what's called a varicel. A varicel is kind of like varicose veins of the veins that innervate the testicle. So they're not just temperature related. It's pretty clear that using deliberate cold exposure can be healthy for the sperm because it reduces heat. Heurerman: We want to remember that excessive heat is bad.

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