Having sex in a room full of people is fun.
Try, Happy Hedonist, or
http://www.trystmag.ca . They are swinger clubs. In the swinger movement a an escort who is hired to go to a swinger party is sometimes referred to as a "ticket". Because swinging is usually couple based, even if they are into MFM sex, a woman is essential.
Would you be willing to be passed around, shared as it were? If you are truly interested you might advertise as such. There are also couples looking for a second woman. Would you be interested in supplying that service?
Swinging usually starts out with a man wanting to fuck another woman. Hence your "in" into that community. Swinger relationships that last tend to be the ones where they are both able to have sex with other people.
EU