MorningWood
10cc on average
Its been my experience that when an MPA you are seeing for the first time asks "how much you tip?", its usually because she's experienced a bunch of cheap asses beforehand and is tired of being burnt. So once you get past that first session and have demonstrated your fair tipping bonafides, the question won't be repeated and future experiences will be better, and your boner developed during the tease will not be lost upon the turnover.