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Can tight underwear cause impotence? - Quora

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So I'm in gym class and when I run my penis slips out of my underwear into my shorts and I constantly have to fix it. How do I prevent it?

Do men position their penis up or down in trunks/boxer briefs? - Quora

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Which underwear is the best for teenage boys to wear under their school uniform? - Quora

Does tight underwear cause erectile dysfunction? - Quora