It’s possible that people who like bdsm may enjoy racial differences more than most. That’s just a guess, based on the way that we tend to eroticise difference more than most.

In bdsm pairs, one stands while the other kneels, one flogs and the other is flogged, one commands and one obeys, one binds and one is bound. The dominant and the submissive enjoy the oppositeness of their partner. So it feels satisfying when one partner in bdsm is black and brown, and the other is pink and white. Contrast is sexy.

That doesn’t mean there’s any less racism among bdsm practitioners than anywhere else. But it’s possible that in bdsm there’s more inter-racial desire.