I know you don't like FriendFinder, but the Adult Friend Finder site (AFF.com) does convert well and pays $55 per paying member, or you can do a percentage. I think they do white label sites for this amount of traffic. They also run some pretty good contests for affiliates.
Other option would be a white label adult webcam site, you can do that through Cams.com or Livebucks.com, and there are others.
I'm no expert, but I'd choose to go with adult dating or adult webcam to webcam sites because they have a social interaction element, as opposed to a straight adult video site, because people can find free adult videos anywhere now.