Are you supposed to wear underwear under men's swim trunks? If so

What are your thoughts on men's swimming trunks, such as board shorts, in terms of style and comfort? - Quora

Do guys wear anything under swim trunks? - Quora

Did you think it is possible to swim with underwear on, or does it look weird? - Quora

How long should men's swim trunks be? - Quora

How long should men's swim trunks be? - Quora

Is it necessary for both males and females to wear underwear under their swimsuits if they are not participating in competitive swimming? - Quora

Are swim briefs comfortable to swim in? - Quora

What underwear do I wear when I wear spandex while playing volleyball? - Quora

What are your thoughts on men's swimming trunks, such as board shorts, in terms of style and comfort? - Quora