I don't do too much gay direct marketing, however with the few links to hosted galleries I have put up I've had the best conversions with:

Silvercash - GayHitchHiker (1:36)

WEGCash - Gay.Join4Free (1:8)

GuerillaTraffic's - Bi&Large: 1:468 (Guy/guy/girl threesomes)

Sorry I dont have more but hope these help give you some idea of non-gay-targeted traffic conversion rates. I'm sure they'd be better with a niche program promoted on a niche site.