Nope, but I would rather that they would.
I am as much of a First Amendment absolutist as you will find. No matter how disgusting I find something that someone else wants to look see, I don't care as long as I don't have to see it and they keep it away from kids. Child pornography is entirely different, because creating it involves the abuse of real children. It is nothing more than recorded child abuse. Computer generated child porn does not.
The problem is is that since children can NEVER consent, and the adults will eventually victimize a real child (statistics and real child abusers say this), sources which normalize it have to be quashed. They can also use images of REAL children, whom they may know, to generate the abuse images. This adds further temptation.
They will never keep their hands to themselves.