Is Lap Sitting Cheating?

If your girlfriend sits in your friend's lap for like 10 minutes at a house party, is that being borderline unfaithful? It's one thing to be a little flirtatious, it's another thing to plop down on a dude's lap with his junk touching your ass! Is this something worth making a big deal over or let it go?

Is Lap Sitting Cheating?
Post Opinion