Simon,
I know its not exactly the same type of site, but Ill bet they will outconvert the same traffic you sent to SG.
I work for Cams.com and AFF, not these guys, but Ive met them and they seem like solid stand up people-
http://www.burningangel.com/
And the best part, they dont even have an affiliate program!
Why do I think thats good? Because it means that they havent settled into any one specific niche of marketing and are probably willing to try new ideas.
I'll bet you could help them become even more successful and they could give you a quality product to market.