Could you not cut out the wanking and just meet with a lady who is happy to let you cum a couple of times during your meet? I am sure most will be fine with it as long as you keep within your time.
More often than not my clients come in, we have a first round which sometimes doesn't even go past them receiving oral as they cum so quickly but then it means they can relax and enjoy a massage or chat or cuddle or whatever they want while they get ready again for the second round which they obviously always last longer on.
If I were a guy, I would think that if I had a wank that I would loose desire to then go and see an escort. I'd much rather save myself for the booking.