I'm calling bullshit for most of this thread.
As a young gay black man, I know that most young, hung, white men are NOT looking for black bottoms that are interested in exploring and submitting to their huge white cocks.
Yes - you may find SOME young, hung white men that are interested in black bottoms, especially in large urban centers that house a lot of diversity - NYC, CHI, SEA; however, the majority are just not that interested in us if we bottom, or are submissive, etc. Even if we're clearly feminine bottoms, they might still be interested in having us top.
The only hung, white males that show a lot of appreciation are OLDER (40+) white males that know that their options are DECREASING. Older white men will try to dispute this but all gay minorities know it's true.
In high school, I only like black and Latino (the one's that looked black) men. I never liked white men until I went to a Little Ivy and was surrounded by white men and had few other options. I never hooked up with a lot of them and got the vibes that they: wanted me to top (I don't like to top), wanted me to make the first move on them and pursue them, were curious in an "I've never been attracted to a black person" manner, which all turned me off. Needless to say, when it comes to relationships between black bottom men and white top men, I would not be surprised if the black partner, even if he is the submissive, is the one that latches on to his white top as if he needs him more. And for that reason, I don't think I would involve myself in the white-black dichotomy.