Why shouldn't guys wear panties?

Answer 1

I don't mean to be disrespectful, but men's bodies are shaped very different on the rear end, panties probably wouldn't look very sexy. This doesn't mean a man can't wear them, if that is what he likes. Most women would agree, that boxer shorts are much more sexier than panties, especially on a man.

Other answer: Panties are not made for men because the crouch area is different, there is a reason why the testicles stay outside so they can be cool, a cool environment is needed for sperm production and panties force them close to the body and this kills many sperm from the heat.