Honestly I find just use the tipping rate on how you eat at a diner. I try to aim at ten to fifteen percent... I tip out a wee bit at the of the fun sexy-time session and it worked. But lowest I had to go is eight cause that is all the cash I had left (after spending an hour and thirty minutes of unforgetable time with the lovely lady) but funny thing is, the last SP I visited she declined the tip. If my memory works well, she mentioned that she loved the "glowing positive review"/input about her and also I knows that I would go visit her again. If you are reading this I just like to say thank you for understanding, till we meet again my lady. And to the ones that assume that I am shilling, well fu** y'all...
One more thing, if it is your first visit with the escort, try to hit fifteen and if it mind blowing (maybe you might not see her again) try twenty percent. Of course it is on top of the rate you paid, duh... Hope that made some sense and some peoples' take on this thread.