I'm a red headed white female. My husband is white and my boyfriend is black. Our local poly community appears to be made up of 99% while people.
I am not saying it's right or wrong of a person to chose not to sleep with a person of another race, but at least with Swingers the relationship is even more in the closet... if the wife suddenly turns up pregnant with her black lover's baby, then what? It would be a sure fire way to get outed. So that might explain why some poly people and swingers stick to their own racial backgrounds. Not something I personally have to worry about, but I suppose that there are those who do.