So you have looked through all the people in your area, and are finding it a bit hard to meet them? Some sites are more geared towards 'intimate' encounters - though it will cost you! Welcome to the world of Erotic Adult Dating. There are heaps of scam sites out there; sites with no real members that just suck up your money. Your best bet is to go with one of the larger and more established sites.
Adult Friend Finder. This is the big one, the site that everyone thinks of when they get in the mood for erotic online dating! This site has over 21 million members, so has by far the most members of any erotic adult dating site. However, they have far more male members than female, so it won't be easy if you are a guy. If you are from Europe (not United Kingdom, though) then this is probably your best chance.
SexSearch This is an up-and-comer in the world of erotic adult dating. They already have over 5.7 million active members, and a huge number of women are members on the site. This site has been featured on Howard Stern, and is especially recommended if you come from the US, UK, Canada or Australia.