Why do guys wear underwear under swim trunks?

Is it advisable to wear a nicker or an underwear beneath swimming trunks?

why do guys wear there boxers under their swim trunks??

I've liked a few guys and some wore underwear. I stopped liking them after that. Is there some reason why guys feel the need ...

I have never tried, just curiosity. Tell me please thank you.

can cotton spandex jersey mix be used to swim in?

what does it do if I dont wear boxers or underwear?

if a guy wears a pink tshirt that means is gay or not no offense its just curiosity.

Why do guy's wear boxer's than short's and then pants all at tha same time, why can't they wear either boxer's and pants or ...

K how do you know if your thighs are too big to wear a swim suit? My thighs kinda brush together near the top, just in one sp...

so for some reason my little brother is not sure if he is positioning himself rite in his underwear. so he asked me how to do...