There will be more BDSM focussed websites, but if you like any sexual play during your session then best bet is here, as if you mention wanting to fuck a Pro-Domme at the end of a session you will be ridiculed as somebody who has no idea what true BDSM is a treated like some sort of pervert.
I've had quite a few Domme based sessions that didn't involve sex with WGs that also do kink stuff, but will do things that a strict Pro-Domme wouldn't, such as RO. Best thing with Pro-Dommes is the investment they make into the gear and dungeons, your average kinky WG won't spend much on gear. Although saying that, it's all about attitude, you can get a very good session without any extra gear if they WG knows what they are doing