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I actually think it's less the 'exotic looks' and more that a lot of white guys like women who are slim and petite with nice hair. That seems to be a pretty common combo with Asian girls. I don't mean 'common' in a bad way, just that a high proportion of Asian girls meet western guys idea of physically good bodies.
Beyond that, guys who were more about marks, less about school sports, may have found they connected well with Asian girls, who seemed less likely to want the jock and more likely to want the guy with high marks.0