I'm sure there are a few. My girlfriend (White) has gotten many nasty looks from Black Women after they see her QoS tattoo though.
Just from personal experience I wouldn't expect to see many on here. I think this lifestyle is frowned upon by many black women.
The majority of people I've seen on here are white women, couples, and black men.
I could be ignorant and wrong, feel free to correct me if I am. Just go easy on me I mean no offense. I bet some of the black men on here would have a more intimate view on this than I.