Have been many times. Tried a few but in my experience they are not very big. Most are very good looking. They are every where in Thailand, Bangkok Phuket, Pattaya.
Just be careful if you get a "FreeLance" girl off the street. Many stories about being taken back to their room only to find someone else there and getting rolled or being drugged and wake up later with all your gear missing.
Good call before by someone saying go to the bar s and rent from there. That way you have some insurance if you get ripped off. Beware !