I read an article in a science magazine several years ago, that had a studies research article in it which stated that Black men were nearly twice as prone to be bi-sexual or gay than white males. Believe it or not, that's what the study concluded. I still struggle to believe that stat.
However, if you have ever taken a moment to watch two well hung Black men getting into each other... while it is incredibly sexy to observe, I get where it could actually make sense. You don't see couples where a 9.5 matched with a 3, unless that 3 has a LOT of compensating money. I check the posts on Double List all the time for men seeking men. Most often, if it's a Black man looking, he is looking for another well hung brother. Why would a Black guy with a 10+ sized cock, want to hook up with a white guy with a 5" or 6" cock? Unless he is just looking to be serviced, he would at minimum be looking for a similarly hung white guy. They exist, just at a lower percentage. Similarly, Black men with smaller cocks exist, at a much lower percentage. For me personally as a happily married bi white guy, I would still prefer to suck on a 6" Black cock, over an 8" white one, based on the quality of what Black cock provides over a white one. Verility, stamina, load size, and just the overall muscular structure of a Black man.
In a nutshell, yeah, I have no doubt that Black cuckold males exist, and are more plentiful than most would think. But I would bet that the majority would prefer to see their woman with another Black man. Just like many of us white men!