i can answer why Chinese men don't want a Western girl.... This comes from a few guys i asked.
The afraid the woman is not a good housewife.
They afraid They too small or the girl too big... Sexually

No one wants to be constantly abused in public by a drunk who brags about whoring.

I get asked to hook a guy up with a waiguo meinu every week. It is the decision of the western girls, not the chinese guys.

Perhaps it's because a lot of Chinese men look like little girls?

I think it's for the same reason that Western men don't date Chinese men.

The little Emporer syndrome is well read by western women. Who wants to date kingbaby who is basically looking for a mommy. Thats why the "housekeeping comment". They have also heard about the small wee wee...lol....

Most of the western woman Chinese looking man couple I know, well, the man was just a Chinese looking foreigner or foreign born Chinese.

I agree with Super8 regarding the little Emperor syndrome. They are looking for a replacement of their mom and a baby machine.

I do have a European colleague that will only consider Chinese men. She likes Chinese men.

Well Size does matter and how many Chinese guys know about Romance , foreplay , manners , etiquette , keeping a woman happy in certain situations ? errrrrrrr...........not many, thats why 50% of Chinese women want to at least have 1 date with a foreigner !

Actually, there are quite a few girls who find Asian men attractive. You should see all of the girls leaving comments online saying how much they love Kpop stars...and I'm sure it wouldn't be any different if it were a good looking Chinese star. What seems to be the problem is that most Asian guys are shy. The type that would ask their male foreign friend for a hookup are not going to be the kind I'm looking for. The other problem is the cultural thing, take care of your parents, listen to them, and they probably believe the stereotypes too. Why do you assume it is always because of the woman that there aren't many of these relationships? Most foreigners in China are men, and a lot of girls may not be into Asian guys (which I don't really understand...? I think quite a few of them are cute). A big problem is also the language barrier; many good ones don't know a lot of English. Honestly it just looks like a big complicated mess when I think about it.

I am a Chinese girl. I have to say most of Chinese men are not brave at all. We had a word named 'MEN SAO闷骚'. Guys don't act as they really think. They look like mommy boy, but actually they are  extremely horny. Gross~  If you like the girl, the walk straightly and tell her. Be a man~