many Asian/Indian men find white women more attractive - that is why models in these countries tend to look caucasian. It works the other way, too. My wife said that she observed in Africa, that white women only married Africans if they were highly educated, handsome and wealthy.
"what it is that makes black-white marriages taboo"
Black Americans are a lower caste - Unfortunately. How many wealthy intellectual white-black marriages do you see? Few. But now Hispanics are the new ------ in America today. (a certain word that I wont use)