hello-
I do mainly gay sites. The sites with the biggest traffic are:
http://www.linkmeallover.ca
http://www.hunkhunter.com
http://www.altagaylinks.com
I think hunk hunter is very good as there are many targeted gay niches and I think it has a big following. Link me all over has a lot of traffic, but after your link isnt new, I think its easy for it to get lost in the mix unless your site is really really good.
Hunkhunter and altagaylinks however requires a minimum of 50 pics, so there arent the same kind of 20pic freesites you find a lot of other major link lists.