[FreedomCalls]

And child rape is a very serious subject that's perfectly legitimate for artists to explore.

No, it's not. As it fits the legal definition of child pornography as defined in the statutes it is not "perfectly legitimate" in any visual form.

[Borges]

There are means of doing this using body doubles and such where the well being of the child is paramount. There are counselors and psychologists on set as well. In any case this isn't the first time. There was a made for Cable movie called 'Bastard out of Carolina' which basically dealt the same thing. And of courses there is Jodio Foster in Taxi Driver...