This might be a bit of a childish sin. There is also a lot of circumstantial forgiveness mostly involving the trifecta of lips, room and state of undress.
This, much like grand gestures, is just an unnecessary risk and a solid perk of a relationship. It is an important thing to remember, both in showing class, and being mature. Risking it with private parts is really more of an indication of how frivolously you are prepared to lose someone.