What happens when Craigslist's Casual Encounters  meets Google Maps ? Hookupmaps !
Search the relationship and/or hookup ads from Craigslist by seeing who's geographically closest to you. It's an admittedly unromantic idea, but hey, I'm not here to judge.
The two ideas had to merge at some point, right? Web 2.0 technology and anonymous lovin'. Like chocolate and peanut butter.
It may not be a story to tell your future grandkids, but by George it's efficient!