Writing about sex with young individuals is not an illegal act. Neither are drawings depicting young-looking subjects. As long as there is no actual person, there is no foul. If it was the case where writing about illegal activities was a crime, then think of how many murder mysteries, spy dramas, thrillers, suspense and sci-fi novels would have to be taken off the shelves. Think of the effects it would have on the television and movie industries, too.

Bestiality, or sex with animals, is, as far as I am aware, legal in every state in the USA, except for Alabama, I think.