My first recommendation would be to try Lavalife's Intimate Encounters section; you sign up with them and then decide which of the three sections you want to be a part of (Dating, Relationships or Intimate Encounters).
You can use different handles in each section under the same account too, so no one will be any wiser if you want to advertise for one thing in one place without ruining your chances for something more should it come up.
After Lavalife, I only know of a few others that are worth mentioning, although I've yet to find one that's truly ideal.
My preferences would be Club Intimate, Fling, Adult Match Doctor, and Get It On, As for adult dating sites that I don't recommend, see my reviews for Shag Pal and Adult Friend Finder.
We've all seen them - the ads show a bevy of beautiful women in your area, but when you sign up, you realize that the women were just ads that were geographically targeted to your search preferences.
Even sites that may once have been good can go bad.
It's pretty hard for any site these days (especially the big ones) to stop fake profiles and scammers from signing up, but I think I get what you're after.
This kind of rigor goes into a lot of my decisionmaking.
The first woman he clicked on was very beautiful, with a witty profile page, a good job and lots of shared interests, including a love of sports.
Suddenly her moans turned into a separate one solid, long groan, all full of passion.
Are you looking for an adult dating site that caters to adult encounters or casual sex, that isn't full of scammers or fake profiles?
If that's the case, I'll admit it's pretty hard to find.