Because a lot of guys' underwear is comfortable. If girls don't like little tiny pieces then guys' underwear is ideal. They can be perfect for playing sport.
I'm guessing that this is a guy so........ why do guys wear underwear. Yeah, it's pretty simple. Hope I helped:)
Wear pants over top of the underwear.
yes
Some teenage girls choose to wear thongs as underwear for comfort or to avoid visible panty lines. However, preferences for underwear styles vary among individuals, and not all teenage girls wear thongs.
Some people are more comfortable not wearing underwear.
underwear and a gumshield.
2%
Some but it is unusual
Uhh...boxers are underwear...
underwear
Some girls like to wear no bra and underwear because they like the freedom of not feeling restricted in tight fitting undergarments.
A boy does not need to wear a girl's underwear if his crouch is getting big because the underwear is not designed for them.