Half-Asians

I know this sounds kinda odd, but I need closure to this question that's been pestering me for a while:

Why are Half-Asian girls so much hotter than either White or Asian girls on their own?

So far, I've asked just about everyone I know, and only gotten two disagreements (who knew an exception) and one hypothesis ("You've been playing too much Final Fantasy"). I only really post on two boards, one of which is not related at all (Wizards of the Coast), and I have no interest in joining a board "dedicated" to "hot Half-Asian chicks" for the sole purpose of asking this question and then taking a scalding hot bath to cleanse myself.
Thus, the question falls to you people.

Why?