Time once again to show I'm not talking from where the sun don't shine and remind people that Yes, It Can Be Done!
One of the most influential directors in anime is Hayao Miyazaki. Miyazaki's been making films for a long time, and his studio, Studio Ghibli has had its films nominated for an Oscar numerous times, even winning with Spirited Away. He mostly sets his films with young female stars, and when he writes kids, he really shows he gets them, understanding them perfectly.
Case in point, My Neighbor Totoro is one of the first anime films most people see as kids, and it stars a pair of girls just like the target audience. They're nice and childlike without being unrealistic, and there's a real sense of wonder to the world they live in. It's a beautiful art film that has rightfully put itself on the map because it's simply GOOD.
There's also a bath scene in it between the girls and their father, and the older sister Satsuki shows quite a bit. Now, when the dubbing team first brought it over, they asked Miyazaki's team what to do with the bath scene, since they worried people would take it the wrong way. However, they were told to keep it in regardless, and the end result was a generation of kids that didn't mind at all. Growing up, the thing I most took away from it was the big laughing fit to get the Soot Sprites to go away; bathing was natural and it didn't matter who did it.
You see, Miyazaki understood that kids wouldn't see any problems with it. And growing up, we never did. Kids still grow up on this movie and they still enjoy it for the cuteness and sense of wonder. It doesn't matter if there's a bath scene between two girls; kids aren't attracted to this kind of thing. Only when you try to hide it does it become a big deal.