Human skin has oils and moisture on its surface, and there's also ambient moisture in the atmosphere that adds to the stickiness, Switch. Do you hate it when your butt cheeks stick slightly--or your uppper arm sticks to your lower one slightly when you contract your arm or to your upper and lower legs, say, when you do a squat and then stand up? Same thing.

If it really grosses you out, use some talcum powder.