Since you sure as hell can bet that they will not pay for anything, and they are completely not filtered into a porn niche, i suggest the following.
use <a href="http://www.freeezinebucks.com/ps.php?s=feb&u=girlstrip">free ezine bucks</a> with their full page add, this lists nearly every niche available. and they can sign up for free, pays $1 per signup.