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Japanese Manga censors have always collided with the acknowledged perception of artistic expression.

The issue usually concerns “Loli Manga,” the captivating childlike characters that are depicted in potentially erotic situations.
That’s one feeling, perhaps, but it’s quite another to claim that sexually aggressive women turn children who skim about them into homosexuals and lesbians.
Part of the problem with the censorship law that went into effect in 2010 is the reality that it is very vaguely worded. It permits censorship of any media that “promotes outlawed or immoral sexual activity.”

Censors can interpret those parameters any way they see fit, stately their own standards onto a medium considered by many to be art.
Of course, the definition of “art” is gist to interpretation as well, and not every Japanese parent may consider beautiful gay boys friendly in erotic situations suitable reading material for their children.
Source: Weird Asia News (press release)