AdultFriendFinder is an adult hookup site for casual encounters, cheating, and swinger sex. It dates back to 1995, quickly becoming a sensation in the world of free dating. Here, partners switch; there are no limits in sexual preferences. The site also promotes safety and anonymity, social networking, and tolerance.

AdultFriendFinder is vastly popular for nude pictures and sex personals. Here, everyone can post a request, and everyone can accept it by contacting the personal ad publisher.

You can register for free, but sending messages is a paid feature. The monthly membership starts at 39.95/month.