As already said, it really depends on your fantasies and what do you like to do
If you want to get a FL at your Hotel you can stay near Sukhumvit 11, there's plenty of nightclubs with FL's
There's so much to do:
Massage shops
BJ bar
Beer bars
Gogo's and Gentlemen's club
Thaifriendly, Fiwfaws and other dating/escorts sites
Visit night markets and try to hook up with locals
There's so many options in BKK