They just left home, so they do not know how to take care of themselves. During sex, their feet are dirty and stinky with toecheese; their hair is greasy; their underarms slemm like body odor; their vaginas smell ripe; their buttholes are pungent with trace amounts of feces on them. It is so sexy!(Edited 1 hour later by a moderator.)
OP is writing his fantasy. He has never been near a college girl. Or a girl.