Had a great Holiday Thailand in October, but went with my Girlfriend, who is Blonde Thai woman, who works as a financial advisor, the adult scene in Bangkok was very active specially around Nana plaza which is next to Korean town and the arabic food area, also lots of market stalls to find fake luxury goods, in Chiang Mai didn't see much while driving around but did some research and there are a few fishbowls around,
in Kho Samui, Chewang Beach there is one section near Green mango with massage girls standing on the streets during the day, night time is very active in that area, with lots of freelancers,