Determining her limits

Hey guys, long time lurker, first time poster. After getting out of a 6+ year marriage, I hit up my first SC in as many years last week. The club is known for high mileage and gives bikini dances. While I think I did pretty good in the mileage department, is there a way to quickly determine a dancer's limits in as few dances as possible (without getting tossed from the club)? The tactic I took last week was to slowly move my hands from relatively safe areas such as the arms and legs to more private areas, over the bikini and finally under, figuring my deliberate pace would give the dancer plenty of warning to make any defensive adjustments. While this approach seemed to work well, it wasn't until my 3rd or 4th dances that I got to the good stuff. In these situations, how do you veterans quickly determine the limits of a dancer in as few dances ($$) as possible? Thanks all, I have much to learn.