Agree there are a few black cucks here along with the rest of us.
While some will count any situation where the wife sleeps with others as cuckoldry, I believe that most on this site now draw a distinction between couples where the power dynamic is equal or in the male's favor (Hot Wife or increasingly common Stage-Vixen) and those where the power dynamic tilts to the wife (cuckoldry). In our case its more in my mindset of service than in her excising power.
In both the above relationships, the participants are enjoying the taboo nature of non-monogamous sex. It only makes sense that historically taboo nature of interracial sex is a good fit. Add to that the perception (probably slightly statistical true) of larger size and more confidence, and the beautiful contract in skin color.
(I'll try to say this carefully, hoping it does not distract. Even among good white people who consciously work to overcome racism - American culture has continued to instill some inherent racism - and this fetish plays on that. Only occasionally is this addressed here. [I grew up and served in the military work hard to provide equal respect and opportunity to all - but I know that racism still needs to actively be addressed in my mind.]
I come to cuckolding by way of BDSM submission. In both BDSM and cuckoldry there are those who adopt submission because they are naturally submissive and those, like myself,who turn to this because it is the opposite of who I am in almost all other aspects. Professionally, i strive to be the in charge Alpha and generally succeed - in cuckoldry I'm the humiliated sub cleaning my wife and her lover.
For some white women this may also be a rebellion against their families. My wife had two long-term black lovers out of college with whom she lived, but this remained a topic never discussed with her parents. Jewish and born in the mid-twenties, they supported integration and affirmative action, but were themselves flawed products of their time.