Adult Friend Finder
Adult friend finder is one of the most widely used, and therefore has many more options, nationally, than most other adult dating sites. This means a lot of options and possibilities, but it is not a niche site for say, bdsm dating or for threesomes in adult, south Dakota.
Adult Friend Finder is free to join for a basic listing! Add a few dollars and you get premium placement, with photo ads, and you can search through more photos ads as well.