Message me with those sites, we might be members already but I would like to see if you have anything better. Looked down on is right. A lot of people, white men, have issues with this and leave comments on "dating/hookup" sites that are either mildly derogatory to hostile. It is racism and insecurity rolled into one big ball of ignorance.
I get why some do not get why any husband wants to do this so it is nice to be able to talk to "real" couples and men who are wired like me. Some of us white men enjoy the idea of their wife being bedded by a hung dominant black man and her enjoying it and the rest of society who doesn't like it will just have to deal with it.