It's all part of growing up. I had my first child at 16, and it was not easy, but I can say I was lucky enough to have made a life for myself, I did not go to collage but I did get my high school diploma and I am a florist. No one coerced her into taking these pictures An 18 years old girl selling her pictures. In Japan I think its 20 for age of majority and 18 for sexual consent.
The whole point of the thing is to make sure kids are not traumatized, and if they make it to adulthood and they are not, and positive consent has made it to legal age for this, then what in the world is the problem? Porn is one thing, although technically with Japan's laws the young lady is still underage, but 'prostitution', and that can be loosely applied here, is something else.
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It's all part of growing up. First you make it sound like a fact, then tack on "I guess"? Police discovered the girl by using the contact details she had posted on the message board. How dumb do you think they are? Not sure when you left under your parent's wing but I am sure you did know head from your tail. But sadly a girl got aids while doing this..