The main problem about that is those tend to be the only things that these shows focus on, or at least the majority. Sailor Moon worries about her weight, her beauty, and similar stuff, but what does Naruto worry about? Saving his frienRAB, beating the bad guy, and so forth. Yusuke? Saving the world, making sure he doesn't get expelled by some jerk teacher, and so forth Basically, while guys get to deal with a lot of problems, girls seem to be pidgeonholed into specifically girl problems (make-up, fashion, etc) for whatever reason. It's also present in non-Japanese shows like Totally Spies, Barbie, and so forth. There's a lot of shows with boys that aren't very 'masculine' (like the hero obsessing over trucks, wrestling, power tools, and so forth) but very few shows with girls that aren't 'feminine' (make-up, clothes, beauty, so forth)
Indeed, it's not that simple, I suppose I should have clarified my point a bit more. Ultimately we would also have to look at our society and the gender roles we create within them. Girls are emphasized for their beauty and sexuality in our society, so obviously our media is going to reflect that. It might seem hypocritical to criticize the shows for those issues in that regard, but I also advocate that our society should also not place emphasis on a woman's beauty (if the make-up and fashion industries were burned to the ground, it would only be beneficial). So, yeah, Sailor Moon wears a skimpy outfit, because it's a reflection of the women in our society who are also taught to do the same thing. The problem ultimately lies with the gender roles in our society. Though I will disagree with the comment that men are unable to judge something as well as women in terms of femnist point of view. After all, if women are raised on certain gender stereotypes, then they probably wouldn't see anything wrong with them. Same with men. So I think it has to do with perception rather than sex.