This was recently discussed.  See link.  

For the ladies who do not see black men, I suspect the reasons are as different as the providers.

Regardless of the reason and what the rest of us would think if we knew exactly what it was, every provider has the right to decide whom she will provide her services.  Given the nature of the service they provide, it shouldn't be any other way.  At least if she puts it on her ad or website, guys know that before they even try to make contact; better than having an uncomfortable phone call or worse, showing up and being told then.

Just move on and find someone who will see black men; there are a lot of them.

Makes sense to me

http://www.theeroticreview.com/discussion_boards/viewmsg.asp?MessageID=576341&boardID=12&page=1#576341