Yes, bras are considered underwear. Most people do not share their bras with other people, and keep them private.
The answer is yes,if brothers share a bedroom there is a chance that they share underwear and look at each others naked body
Umm why ?
Makeup and underwear (usually).
You will pee/poop in your underwear
No. Men and women wear underwear to bed all the time and nothing bad happens to them.
Nothing happens.
you should put in a tampon and wear a pad in your underwear
you smell, and mold grows on you, and you may die.
wash them before use and its ok
Nothing, as a lot of men wear their underwear more than several weeks (I mean days!).
Nothing happens-becuase you can't. No kid has the power to trade your soul.