I always tip at the end. I’ll go into a session with a base in mind for a tip, then what’s odd lately for me, is I’ll start adding and deducting in my mind during the session. Like she’ll take the money for house and disappear. If she’s gone too long or I hear her chit chatting with other girls on my time, I’m deducting. Or if she does something that really excites me as a surprise, like a bj while getting undressed for TS, it goes up.
I mostly see repeat girls these days, and I tip extra to encourage spontaneity/creativity. I’ll see the same girl 3 times in a month and my tip amount can fluctuate as much as 100. These girls get the message pretty quick.