Sex with minors has come up as a news item a few times recently ...
I found this BBC article is very thoughtful, not least because it includes the victim's perspective.
"I thought I was a big girl... I was about 12, 13, and I was drinking. It was causing me trouble. I got sexually assaulted, under the influence of drink," she says.
This led to older men - late teens, deliberately targeting her.
"They take advantage of you. You're not in a stable situation so you're going to be all flirty and thinking 'yeah I'm getting boys' attention'. They take advantage of you because you're younger."
"They can tell you what you want to hear. They can tell you I'm going to buy you this, I'm going to buy you that. I'm going to be your prince charming."
Clearly highly illegal. And equally clearly crossing the boundary between healthy curiosity and unhealthy exploitation.
Full article here:-
http://news.bbc.co.uk/2/hi/uk_news/education/10508392.stm