no seriously. consider changing them. why; a girl will never suck your nuts, let alone your penis, let alone hug you. and my mom said you're not invited to dinner because i just read this to her and a friend out loud.
i don't know man. you don't sweat? you don't get like crusty curds or something? haha ew. everyday man. maybe even twice if it's a bad day. dirty underwear seriously affects the funk between your legs.