There is a post in Fanficrants about teenagers writing slash

I’ve got a secret for you. It is big; it's juicy. I don’t want you to share it with others. Please, don’t read further unless you can keep a secret: There are teens in fandom. There are teens reading fan fiction. There are teens reading slash. There are teens reading sexually explicit fan fiction. Horror of horrors, these teens aged thirteen to nineteen are doing something much worse. This is the really secret part. Cross your fingers and swear to die. Don’t mention it to anyone: This evil fan fiction species, these teenagers, are also writing fan fiction, slash, and the total absolute worst, sexually explicit material! And it isn’t just heterosexual stuff that these teenies are writing! They are also writing boyslash and girlslash!

And it goes on.
EDIT: And zannechaos brings the CF wank to the yard.Thanks, feenix. And here's a summary of the tl;dr.