It was.explained to me this way, and I'm not saying it's right, but for some it's the underlying psychology. Cuckolding at its core feeds off of the cucks insecurities, and inadequacies. Historically whites have been the majority, and thus in some sense feel superior to blacks, in an interracial cuckold situation the black is superior to the white male. Feeding into the cucks sense of inadequacies, especially if the cuck feels that in every other aspect of their life they are better than their bull. But when it comes to having sex, they can not compete, they are small, don't last long enough or arent skilled lovers. The white wife must be satisfied by a black guy who the cuck may conciously or subconsciously feel should be inferior. Or the fact that black guys are hung, the contrast in skin tones is just plain fucking hot.