You mean "adultfriendfinder.com"
You are likely to find mostly cheating spouses and fake profiles that are put up by AFF. I have heard that they are owned by the Russian mafia or something shady. The site is about 90% men - most of whom are pretty sad.
However, back in the day, I actually did get laid off AFF. I'd guess 3-5% of the ads are from female sex addicts. Keep in mind that your chances of getting VD are higher, and any woman you meet off AFF is not exactly relationship material.
fwiw, there are even bigger freaks at alt.com