Is this just about BDSM fantasy, or is he paying for a dominatrix?

I recently stumbled upon some disturbing web sites that my boyfriend had been looking at on the internet. Mostly they were in regards to BDSM and submission. I am not a prude, and porn does not bother me, the thing that bothered me the most was that the most frequently visited sites were for dominatrixes in our area who perform these acts for money....