It's bad to molest people who are asleep.
Fred wakes up feeling aroused when he comes across his roommate Grace passed out on the couch.
Fred wants to relieve his arousal.
Fred goes to the bathroom to relieve his erection.
Fred lies on top of Grace and rubs his penis against her until he is satisfied.
Fred's relationship with Grace is not jeopardized.
Fred feels lke a creep when he later contemplates his actions.