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2.1.3 Explain the consequence on human reproduction if a male wearstight-fitting underwear all the time.​

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So by "hanging out," the scrotum keeps sperm a few degrees cooler. Too much heat can lower sperm count (but not enough to act as a form of birth control). So tight clothing and underwear that keep testicles closer to body heat might, in theory, affect sperm count.
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