I haven't once come across in RL any blacks interested in BDSM. Those are extremely interesting questions you've asked, Alex.

From personal experience, I am white female who has slept with a few black men in my life. And yes, they are bigger! LOL
My 2 sons are, actually, half black.

All of this took place eons ago when I was in the Army. Crossing the 'color' boundaries was not a taboo issue while serving together.

Due to the fact I have the 2 children,I have always been a part of his family, even though we split up @ 13 years ago. It's given me many insights into their psychological make-up.

It's amazing that so many of the women are strong willed, and the men tend to be more subdued in their personalities. This works between the bedsheets, also. (Honestly, that doesn't work for me, as I always knew I needed a man that was "more man than me!")

Just watch any of the numerous black TV sitcoms today, and the women tend to dominate the men. Maybe, this is why actual BDSM doesn't work, as they are inherently already living it in one form or other.

Just some thoughts/ observations.