I hear what you're saying, but the stats show that most Oriental women who marry outside of their race are American-born. Which would you say are more feminine - American-born or foreign-born Oriental women? I vote for the latter. And yet most American men go for the former. I figure it's got to be looks.
Complicated questions you raise. There is more interracial dating, and interracial attraction, than interracial marriage. Marriage being about much more than attraction, if the partners are being smart about it. Obviously, American-born Asian women are “whiter” culturally than immigrant Asian women, on the whole. I unfortunately have no experience dating American-born Asian ladies, only immigrant Asians. But I think both groups seem equally feminine — which is not to say that all the ladies in either Asian group are. Generally, I’d say American-born Asian ladies are somewhat, or even, better-looking.
I’d add this. It’s my impression that foreign-born Asian women are, on average, in comparison with Asian-American ladies: less confident as individuals, less comfortable or uncomfortable with sex (and even dating), more likely to live with parents even at rather late ages, less affluent, less stylishly dressed, less familiar with the culture, less educated, and needless to say, often with very poor English language skills. Whether they’re more feminine or not, they’re at a big disadvantage compared with Asian-American ladies.