A few months ago, I was with a girl in a park. She dropped some rude comment, and since I'm pretty sarcastic, I said "Oh how dare you" (insert sarcasm) and tapped her smartly on the side of her face. It wasn't even a slap, more of a sharp tap. She gasped and her eyes bulged, and threw a slap at me. I blocked and rapped her sharply on her cheek again. This time she made growly sexy noises and tried to slap me again. I blocked and tapped her again. This continued until she was grinding on me, biting my lip, and making sexy noises in my ear. Worked without fail for the entire course of the relationship. I've done this with other girls and gotten great results as well. The physicality is a great way of establishing dominance/playing the asshole card/starting foreplay. The playfulness of said physicality prevents it from being a turn-off or perceived as abusive, making it the perfect tease. It must be emphasized that you should USE AS LITTLE FORCE AS POSSIBLE. NO INJURIES SHOULD BE CAUSED, only some shock and a bit of injured pride.
tl,dr: A LIGHT smack on a girl's cheek is a great way to play rough and establish dominance in a lighthearted manner.

EDIT: I had been in a relationship with her for a month or so