Shintoism openly celebrates male genitalia. Manga has a lot of sexual content but it's not creating demons Americans are so afraid of.
But Americans needn't worry, because they already carve that part off of the infant's penises, along with the foreskin.
If you've seen Dragonball Z comic books, there are scenes where Goku's penis is uncensored and emerges in his early days or Bulma showing her boobs (vagina is erased) or flipping the bird before a major fight, and other adult themes can be found (dirty magazines, sexual innuendos).
No kid complained. I mean it made the comic book so much more worthwhile to read. Like little cherry topping on top of a great storyline and characters. This sort of 'teasing' is so prevalent in kids and teens comic books. I mean there were even more crazy ones like Ranma we watched as kids.
When I read the same comic book in English, all those 'no no not in America' type of scenes were removed or have gone thorough de-perversion.