Some Stats (y'all know I love bringing data)
70% of all white/black interracial marriages involve a black man and a white women, only 30% involve a black woman and a white man.
An Article in National Review stated that when compared to White men, White women were 10 times more likely to report that their most recent sexual partner was Black.
(Basically black men are attracted to white women and vice versa)BP
Note however 97% of all marriages in the country involve people of the same race.
(so they really arent' getting married that much though, just doing the nasty)BP
So it's not really clear that black men end up with white women in such huge numbers, they seem to just hook up/date, whatever is the pc way of saying it, but they don't end up getting married in huge numbers.