I think you can try with bookmarking ? I think it could bring you some targeted visitors
Please try it with bookmarking and let us know how it goes.
Is it a free membership site?
I once read about someone who had a dating site, free membership and he was making crazy money with Adsense only. something like
$50,000 per month.
Non Adult of course, he was one man band as well, no staff.
You can try using regular traffic source like social bookmark, blog comments, traffic exchange, forum comments, etc.
What script do you use?
Good luck with your site!