Only one time I can remember, in fact I'd totally forgotten about this woman as it was about 12 years ago, towards the start of my punting. I turned up to a booking and she was quite disappointing visually - the pictures didn't show a pot belly with a weird tattoo around the belly button, and she just wasn't very attractive in person. She did the job adequately, but I felt a bit cheated, so I went and booked someone I'd seen before and had another round with her.
Other than that, just a few visits to FKK clubs in Europe, but I'd generally try and have a rest between women. Although there was one time in GoldenTime in Vienna when one girl kept pestering me straight after I'd come back from shagging another girl, even though I kept telling her it was too soon, and I ended up going with her just to make a point. Bit of an expensive told-you-so, not exactly recommended.