Here's a bargaining technique that Social Psychologists have been studying for years and i believe can be transferred to the PUA community.
(1)First think of something you want. (kiss)
(2)Go total caveman and request something way out there (go down on me on the dance floor). She'll probably laugh or act a little appalled. If she says yes, then you have a great story anyways.
(3)Immediately after request something slightly less appalling but still caveman. (groping). The reactions will be slightly less than that of (2)
(4)Request begrudgingly the thing you wanted in the first place. You'll get it.
Welcome to the world of bargaining.