Why is uncensored porn illegal in Japan?

Question:

In the country of Utamaro, there are not any religious taboos about sex things though.

Answer:

Believe me, this question has been asked by lots of Japanese people for quite some time. While there are no religious taboos about sex for the most part, there are however plenty rules in Japanese society dealing with public morals.
Utamaro is considered Art, and therefore acceptable to be uncensored...however you wont find it out in the open and publicly displayed. The borderline between "art" and "porn" however is an extremely frustrating topic and controversial...especially for western movies.Is the nudity in the film "art"? or is it just nudity to enhance the story? The real problem is, that the laws governing public morality are pretty vague and deciding what is showable or not is pretty subjective. You would think that in this day and age they would stop censoring movies especially since the illegal porn market is pretty big.
In my opinion, since there is no real public outcry, the Japanese government doesn't find the need to do anything about it. Plus it makes the Japanese look morally superior...."we don't have that kind of dirty porn in Japan like they do in the USA". Sound stupid? Yeah it is.
What is even stranger is that about 7-8 years ago a poll was done concerning Japanese men and weather they would like uncensored porn or not. Surprisingly, a large majority said they preferred the censored stuff because "it forced them to imagine what they couldn't see", therefore making watching porn more exciting.
The sick thing is that Japan has by far worse porn and stuff that goes beyond morals....and yet they cover it up? Trust me, even the Japanese are confused by the whole thing.