I think Kritiq has hit the nail on the head,
Streetwise 12-15 year old girls are not seen as or treated as children.
But they are, they may drink, smoke and have consensual sex with similar age boys, but they are still children.
They still live at home, have to go to school and have very little money of their own.
They are very very vulnerable to attentions of any man who makes them feel more grown up and gives them more "freedom" than they feel they have.
If your doing badly at school and getting shouted at at home, a few kind words and a bag of chips may be all it needs to start a "friendship".
Society sees a backchatting, tall, tartly dressed young woman, it's the abuser who sees and prays on the frightened child inside.