The generalizations about Black vs White on this site are annoying. Let's talk about straight vs gay vs bisexual. I think it is safe to say that every man likes receiving a blowjob. Many straight men are bothered by the idea that it is a man touching their genitals, but if you put a blindfold on them and tell them that it is a beautiful woman sucking them, they will orgasm in seconds.
If you place a blindfolds on ten men and have them receive blowjobs from five women and five men. They would probably choose the men as better cocksuckers, because men understand how it feels to receive fellatio and will have better technique. This might be an interesting scientific experiment for your next swinger's party.
The question is whether Black men are willing to accept enough bisexual contact to receive fellatio from another man. This is where I would tell them to release their taboos and enjoy the orgasm. A large percentage of men would not be willing to do that, but those who do are guaranteed a good time.