I actually think its pretty complicated. I think cuckold is about the white guy getting off on sharing his woman for sex, but knowing that she still stays with him because he is responsible and the bread winner. Somehow it is STILL about claiming intellectual superiority over the black man. He's saying: "You might be fucking her now, but she chose me first and will come home with me tonight." You can have her body (for now), but only I can stimulate her mind. Same old power trips.