Because Japanese people are only good for building cars, and drawing pictures of fetishes nobody cares about - except for weaboo freaks. And if you look, in the past, the culture is very sexist, as are many compared to American, and European culture. That isn't to say Americans, and Europeans aren't sexist, but it's much rarer. As in other countries, Japan, China, even the middle-east go as far as to 'hide' their women, label them property, and use them for nothing more then house-wives, and baby-makers.
As far as the picture, if you think about a fetish revolved around the idea of humanoid animals, IE, cat-people, collars, leashes, bowls, and what have you are all apart of the image. Which is stupid, and makes me hate humanity more and more now that I think about it.