The most caveman I've done is grab a flock of her hair and pull it softly and spank her ass on the dance floor. That's while we were dancing/grinding on each other so it was very much on. Like Roosh said in one of his videos it's incredible what girls will let you do when dancing with them.
If it won't matter in 30 years, it doesn't matter now.
My thoughts and memoirs: yourfriendtrent.wordpress.com