And this is where I'll be dropping this. It was all going so well, too.
The authors who trot out this garbage should be fucking ashamed of themselves. Ruins perfectly good stories, and not even really for fetish reasons - most of it's just angst over the way decent human beings react to Japan's history of industrial rape slavery (after slaughtering all the men of course).
Given Japanese history there is no way I can't see that gaping, festering wound in Japanese culture oozing out of these mangas like pus whenever they attempt to justify the slavery in their setting. I've got no patience for slavery apologists, and these seem to think the only thing wrong with real life slavery is a lack of magical coercion. Fucking disgusting.