I was 19-20 years old, living in Tacoma, WA.
After work one day, I was out for a drive, and picked up a hitch hiker. She looked about 16-17. We had sex. The next day I took her to the fair, where she told me that it was her birthday. She told me that she just turned 13.
Later that day, the police showed up to arrest her. They took her back to the institution she had escaped from.
They did not arrest me, nor was I charged. I was told by the police that this was a common occurence for her, to run away from the group home, find a guy and have sex with them. Then she would call her mother, and tell her that she had sex with a stranger, because she was angry at her mom, for putting her in the group home.
I have no idea how old she really was, I assume that if she had really been 13, I would have been arrested, and charged.
That incident scared the holy shit out of me, as I found out how mean, vicious, spiteful and cruel people can be. I would say that it traumatized me, and has affected my relations with women ever since. So if it seems that I sometimes have trust issues with females, now you know why.