>>508828195 (OP)Exoticism.
Asians diverge from the baseline white human form far enough that you can't perceive the subtle variances in facial features that would, in white women, be perceived as distinguishing a pretty woman from an ugly woman. All you see is a thin pale female, and the oddities of her appearance are just glossed over because you know she's of another race and thus not held to the standards you'd hold your own race to.