I think it has more do with cultural and intellectual differences than pure physical attraction.

I prefer Chinese because I can speak Chinese, but I fap to Japanese girls. I can't say its because of otaku stuff. I just think they are cute. There are cute white women, but they are more rare, because white women always try to seem more mature than they are.

Chinese or Japanese girls have a different attitude when it comes to sex. Or, really, most things. If I talk to a Chinese girl, she will say how cute I am. But white girls treat me like I am gay.

Part of the appeal is that they offer a different perspective, and you can see how that differs from your own when you interact with them. I know exactly what a western woman believes and thinks. They wear it on their sleeves. But among the Chinese, they present outward uniformity with a significant degree of individual deviation in their private, unspoken thoughts. To be forced to be unassuming makes them more contemplative and capable of having more in-depth discussion when they are around someone who they feel they do not have to be mindful of public opinion around. Chinese women are also open minded when it comes to spirituality. I'd say a large percentage of them have some sort of belief in spirits. One woman told me that she was afraid she would face punishment for not being able to make an offering to her dead father. I have never met a white girl who says such things. Even if they are religious, it is performative. Which is ironic, considering the racial stereotype of Asians is that they are the ones who are all soulless, conformist drones.