I used to think that if I paid to get into a swingers club (anywhere from $20-$100), I deserved some sex out of the deal. This logic wore off pretty quickly, though the desire and intention haven't. Many times Soccer Dad and I go to swingers clubs just to hang around like minded people, flirt shamelessly, and behave borderline inappropriately. Believe it or not, sometimes we aren't even looking for sex.
Swinger clubs are sexually charged by nature. The music is typically sexual and the women are dressed sexy. Combine this with a little alcohol and the party girl in me comes out. At this point I do expect sex and it usually happens. Sometimes it's with a friend, sometimes with a stranger, and sometimes with Soccer Dad. It's really a win win situation for me.