My experience is with GF's & SP's, about 20 total, in US & Asia. If in the US, they were raised in Asia. I won't speak to stereotypes or generalities, just my own encounters. Not a big fan of Asian-Americans (bananas for the most part!), they seem like any other American woman (fat & loud). I've had serious Asian fever for eight years, exclusively date Asian women, go mostly for Asian sp's.
I've never understood the idea about submissive Asian women. All the ones I've known always get their way. What I love about them (aside from their bodies) is that they can be smart, powerful, & strong, but still be WOMEN: soft & feminine!
One reason, other than my attraction to the traditional culture, for my interest in Japanese women is that they're here by choice for adventure. They're not desparately escaping from a shitty poor place, as are many other Asian women. So they don't need me for a visa or support.
Currently my GF is Japanese. Sweet, clean, sensitive, polite, helpful, shy, humble in public or in front of my parents, but in bed we go at it like wild ravenous hyenas (no complaints there!). Out of bed, sometimes a bit too quiet in voicing her needs, and if I misread those needs and make the "wrong" decision because of no input from her, she lets me have it, so yes, can be really passive-aggressive ("Wanna go for a walk, honey?" "Whatever you want darling"...so we go, & it turns out she didn't want to at all, & is angry that I couldn't tell that was the case....grrrrr)
On my trips to Japan have met many of the penpals I've found on the internet. Very open, friendly, and we always had fun in unexpected exotic ways...
Was engaged to a woman from Taiwan who by her own description thought herself more Japanese than Chinese. Manipulative, secretive, and proud of it. Refused to ever tell me her age!
Had a GF who was from mainland China. Smart, earthy, very open & relaxed about sex, no American Christian hangups. Very refreshing.
Hard to generalize about Chinese women, as there are many nationalities & 50 ethnic groups. Many cultures with varying views of sex. But every Chinese woman I've known well, ranging from a snobbish gold-digging social climber to a sweet simple country bumpkin, none could ever bring themselves to say "I'm sorry, I made a mistake."
Was introduced to a chick in Shenzhen (SW China), spent some good times with her & thought we connected well, she played all manner of crazy games with me, used me to get her BF to return from Paris & marry her, even though she swore he was history. But was she hot!
All my experiences with Viet-Americans: the package certainly gives me instant hardons, but the baggage is a bit much. Pushy, smart-ass (sometimes that can be exciting though), have yet to really get involved with one.
SPs? My first ever was a Viet in HK. 33, had a kid, but had a tight hot body & pussy. She was very kind & patient, invited me to stay at her apt. overnight so we could have some away-from-the-club action.
So many SP's lie & say they're Japanese, I get so sick of it, but I can always tell.
I so wanna go to Thailand!
Indonesia too. I know there's so much Muslim anti-sex anti-woman repressive bs there, but judging from the multitude of ads on adultfriendfinder.com, there's an underground of very liberated sexual women there, many of whom appear to be educated & speak English. I know guys who've been very successful at getting freebies there.
So my preference order (judging from my hardon size : Japanese, Thai, Indo, Viet, Chinese, Cambodian, Korean.