Anima introduced a child of mine to transexualism and homosexuality.
The biggest problem with manga and anime is the labeling and/or rating. There are named categories that could tip off a parent to unwanted content, but relatively few westerners know what to look for (unfortunately, the kids often *do* know what those category titles mean). A lot of the stuff that is *not* rated TV-MA has too much adult content.
That said, there is a lot of anime that is not only totally clean, but exquisitely crafted. It's a shame that this true art is in the shadow of the nasty, poorly illustrated, fetish-laden stuff.
Not to pick a fight or point fingers, but you allowed it. My kids don’t see/watch anything that I do not watch/research first. They especially don’t watch 99% of the cartoons/animation crap that is out there.