Where to meet woman online for no strings attatched fun?

Hi all. You read and see on TV here and there about guys and girls hooking up after meeting online. Meeting up not really for dating, but just for some illicit fun time in the sack. Where are these web sites or chat rooms? I'm a goodlooking guy in my 30's looking for some no strings attatched fun. And I don't want to go to sites just frequented by call girls, professionals, etc. Just real girls. I live in the Bay Area of Northern California. Any suggestions? Thanks, J