I am not the ultimate authority by any means, but...
What is the laws about prostitution in japan?
Illegal. However there are many loopholes. Enforcement is random.
What is the age of sexual consent in japan?
I believe it is effectively 18, set by all prefecutures individually as the "official" central government age of consent is 13. (Don't make a fuss. 100 years ago it was 10 in America and 7 in Delaware). And despite the national age, the AOC applies to the residents of the prefecture whereever they go. So if a 20 year old woman has sex in Chiba with a 14 year old teen male from Saitama, she will be tried in Saitama....assuming there are any complaints I doubt there would be. I don't think the police would pursue anything without a complaint lodged.
The AOC for Tokyo and
Nagano prefecture used to be 13, but I think that has changed since.
I think the AOC for marriage is 16 though, so once married, no legal problems with sex.
Is there a "RED LIGHT ZONE" in japan?
Sort of, in many cities. Generally you know it by Chinese, Korean and other women standing in a spot on the street asking passing men if they want a "massage". What all you can get I don't know. I never tried.
How old do you need to be to buy Pornographic material in japan?
18, but I never saw anyone asked for ID.
How old do people need to be to be in Pornographic material in japan?
18
What is the law about bringing Pornographic material from japan out of japan?
Zero. Its always the import country you have to worry about.
Bringing porn into Japan is the problem, but the inspectors usually just take it away from you (for their own consumption of course!"
BTW the law is everyone's business. The only perversion is that most of us have not been duly informed and even my information is not 100 percent correct or complete despite paying more attention than most.
---------- Post added at 12:22 ---------- Previous post was at 12:05 ----------
And for as much as people purport to care very much about these things, it is amazing how few facts they have. That is also a perversion.