Everybody Loves a Good Jazz Square!

My dorm has always had a sort of smell. I've aired it out and cleaned so much I don't know what it is. I think I just figured it out.

My roommate's boyfriend smells. Like someone who hasn't showered in AGES! Like sweat and stale beer, too. It would be extremely rude to leave a note in her bed politly asking her to air out the room when he comes over, wouldn't it? Darn.

As far as I know, he doesn't have a home and stays with friends most of the time, but why does he have to leave his stuff here so it can smell?