Interesting discussion. It has to do with the baalance of power between men and women and between white and black people.
Could it be a possibility that women are ambivalent when it comes to sex. On the one hand they want to f*ck the most potent men and not only one ;-). On the other haand they want to be secured and need a steady environment to raise their children?
And last but not least what is in it for the hubbies?