I've had amazing luck sending BDSM traffic to
GUBA (Gigantic Usenet Binary Archive). They are a user-friendly front-end to the "free" porn on the usenet news groups, that most surfers aren't tech-savvy enough to get to otherwise. Converts about 1:350 for me when I send BDSM traffic to links like
alt.binaries.multimedia.bdsm or
alt.binaries.pictures.erotica.spanking.
Lots more info, if you need it, in my .sig.