I return 1:1 uniques from the following sites:
Sexy Sluts
Free Porn
Naked Sluts
The toplist is automagic so just start sending traffic. I'll also take a trip back to your site to see if I can find a hosted gallery to plug.
FYI: Sites with popups, spyware, questionably legal content won't be allowed and if I find them on my toplist I'll ban them.