i use it as an attention getter for my sub. She does not like it as a turn on, but she understands its just a repremand and not me trying to harm her. I dont like doing it, im afraid im going to blacken an eye or just end up knocking the crap outta her, she's a tiny lil thing and i got huge mechanic hands. Most of the time i can just raise my hand back and threaten a slap and she get's the point, i dont know if she's just extra frisky or something some days but every once in a while she gets the bite..

another thing i do sometimes is that slap to the back/top of the head thing. I dont know what to call it, but everyone has seen it and done it before. It really pisses most people off, and when i do it in the opening of a scene it sets her in the mood like "ok MF'er i can take what you got, bring it" which always is fun for the both of us.