It's the fetishization of Japanese women and the culture as whole from weebs. For whatever reason, weebs think all Japanese women are these submissive, traditional people when they really aren't. Shocker, amirite?
Much like every woman, they have their individual morals. They all see cheating as normal because the men there are herbivores or people who are whipped into this idea that work is more important than attempting to have any kind of relationship or maintain a healthy one at least.
The only thing almost 90% of Japanese women have in common is being completely insane or materialistic as fuck. They're all not submissive. That's the cold reality these yellow fever fags need to understand. And if they never do, they'll just settle with a Filipina like always.