Asian girls, particularly indian girls, are often very beautiful and, to a white guy like me, slightly mysterious. I had an indian girlfriend for about 2 years when I was at university, and she was so amazing looking that she used to make my head spin. She got so much grief from her family (particularly her brothers, who were a pain in the ****) about me that we eventually had to split. Younger asian girls tend to be a bit crazy, especially when they get the first taste of freedom away from the family unit. When they've grown up a bit they are lovely, though.
Just a guess, but I would say it's definitely it's a fetish. It may also be that they look younger, have smaller bodies that make them look younger and guys are perverted like that. But there are a lot of beautiful asian women. But it's definitely a fetish or fantasy. Same thing with white girls that have a fantasy with a black guy.
I think it's because men like submissive women, at least guys who don't have a backbone (since it's seems a lot of nerdy guys like asians, and specifically date them). I just find it weird that guys go for a certain race. To me it seems wrong. I try to look more for personality and if they are cute, and there are good looking people of all races. For me that doesn't matter. If they girl I like is white or black or asian, it doesn't matter to me, it matters what their personality is like, and I think some guys just go for certain races for the wrong reasons.
Because Asian women are exotic and most of them are tame and easy to boss around! Men feel stronger when they are with Asian women! Men are scared of women with liberal minds. They feel like they will be swallowed alive! hahaha!