Craigslist is full of gross people looking for casual encounters, but there are plenty of sites where the girls are good looking and up for just about anything. Pick what fits you and start hooking up now.
This is the largest fuck buddy community with girls in just about every city. You can sign up free to start checking out the talent but have to get an account to contact them. It's a solid community with quality listings, making it easy to pick up a fuck buddy.
This is a newer site that is based on flings, so basically everyone there is looking for a one-time encounter. Those people are looking for something quick and probably not an ongoing fuckbuddy relationship, but you can try for a night or weekend and see how it goes from there.
Younger people get right to the point by having a site that is to hookups what Facebook is to the social world. Why talk about what you're having for lunch or where you are going for the weekend when you can be focused on your sexual proclivities and network with others who might have common interests?