I myself have been studying this subject for a while. As it turns out, in Japan, where the majority of dubbed Anime comes from, the films hold a number of things that normally wouldn't be shown to kids here in America.
For instance, in Sonic X the original version holds quite a bit of swearing. (I dare one viewer of the original to find one episode that doesn't hold any of the following: shit, bastard, bitch) The swear words though are used to give more meaning to a scene (Like the possiblity of the charcter unable to out manuver a homing missle) or insult someone. Never once using it as comedy. In the third season, there were several scenes that had blood, but was hard to catch. (I believe that the original animators were trying to figure out what they could hide from the dubbers, and they definately got them.) They also had one scene where a woman was aging at an increased rate and showed the breasts developing. And guess what? It counts as a show for kids over there!
In the original first season Opening song for Pokemon, it held the following line:
"I will go anywhere.... even under a woman's dress"
This was the main reason why the song was changed for the dubbed version. Still, the original counted as a kids show, despite that problem.
I got the oppurtunity to watch Spirited Away myself. In fact, I have it saved from when it aired on Cartoon Network thanks to DirectTV. I do not remember the scene of sex that was pointed out, but it has been a while. However, I will probably forever remember the scene where that dragon bled alot. Ugh! To think, they allowed the uncut version to appear on Cartoon Network in the morning. Think of the little young eyes that would be watching that. :blink: Still got a PG though. <_<
If you ask me, I think Cartoon Network has a better sense of what can and can't be shown to kids than most USA TV programs.
Yu-gi-oh! the Japanese version holds all sorts of blood, violence, swearing and so forth. It's one of the few I found that counts as something for older viewers in Japan.

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If you ask me, this research has helpped me in seeing what CAN and CAN'T be shown to kids.