Are you supposed to wear underwear under men's swim trunks? If so, which type? - Quora

Answer (1 of 7): It all depends on the wearer and the type of suit. Myself, if I am wearing a bathing suit with a smooth nylon line, I do not wear anything other than the suit. If it has a mesh line, I have to wear underwear or else the mesh, rubbing on the head of my penis is very painful and I

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