A member asked:

Does wearing loose underwear so that the testicles are kept cooler maximize sperm production?

3 doctors weighed in across 2 answers

"Wearing loose underwear" will not enhance sperm production, but may prevent some inactivation if body temperature is reached with tight fitting shorts. There is generally sufficient excess of sperm for pregnancy to occur, even with tight underwear, but get a semen analysis from a urologist to assess the situation.

Answered 5/21/2021

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No, The testicles are not warmer in a tight fitting underwear, enough to lower sperm count.

Answered 5/27/2021

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