I think if it was not for the history of racism and slavery, race play would not have been so hot. There is definitely more to this than just skin contrast.
I think the reason I like race play so much has to do with the environment I grew up in, I was surrounded by a lot of racist family members and friends from a very young age, this obviously made it EXTREMELY TABOO. I can remember whenever my family members saw a white woman dating a black man, they were revolted and completely disgusted by it. To say they were disgusted by it, is actually a massive understatement. There is no word that can perfectly describe how immensely taboo it was.
I constantly had to listen to how whites were better, more powerful, more civilized and more hygienic than black people. The one that I had to listen to the most and that I think played a huge part in my obsession with race play fantasies, was how important it was for white men to protect the genetic purity and vaginal purity of “our” white women. White women were seen as being incredibly pure, pretty and the ultimate symbol of hotness.
I think it's also important to remember that many years ago black men were killed to protect the purity and vaginas of white women, I believe this amplified the taboo factor to exceptional levels, I think this might be a reason why some cuckolds have masochistic fantasies, it's like a form of self punishment for past wrongs. I am a masochist so I understand why some cucks add some masochistic elements when it comes to race play, It feels incredibly nice to be on the other side of the power dynamic for a change. I find it very sexually arousing to be completely and utterly emasculated by a black man.
If you add all these things up, I can understand why some people get turned on by race play. If you grew up in an environment where people were constantly talking about the “purity” of white women, I think after a while the fantasy of seeing her “purity” getting defiled can become incredibly arousing.
One of my white male friends once said “The worst thing that could happen to a white male, is his white wife having sex with a black man”, I was completely horrified by this idea at first, but after a few years I actually started getting aroused by that possibility.
The first time I saw a white woman dating a black man, I was enraged, jealous and upset by the sight of it, but now I just want to whore white females out to well hung black men.
I'm not sure what causes other white males to have extreme race play fantasies.