"if they met someone like aishwarya rai (google her)"
Holy cow she's HOT!
But seriously, what are the chances she sits next me and asks me out? Most of the times guys need to take initiatives, start the move, ask the girl out, and entertain her. And it is hard to do in a language that is not your own. Young girls, however, generally get flocks of guys asking them out. And generally caucasian and African people are taller and more muscular. While guys being tall and muscular is generally considered attractive, being skinny and short isn't.
And of course, Japanese girls ARE cute, Ronin