Another nice thing about fanfiction is that it serves as a sim wherein people can make, in safety, what would be catastrophic sexual and romantic decisions in real life. Whatever threat Edward Cullen, Christian Grey, or Hannibal Lecter might pose to their fellow characters, a reader can put them safely back in the book (or video case, or computer file) when she's had enough of them.

(Also, I don't believe that the perennial genre of Mumbledyteen Me!-By-Proxy x Mumbledlysomething Bishie McStudmuffin really ought to be judged as child porn--particularly if McStudmuffin's [or his actor's] career has been predicated upon being desired. Should Studmuffin decide to respond in kind to his tweeny fan, that's a whole 'nother can of #MeToo.)