I wouldn't go with that argument. There are all too many people who believe that facilitating injury or the potential to commit injury is equally criminal. I've already heard it said by those who normally are very studious and discerning on issues of constitutional law, that even virtual porn fosters lust and can thereby lead to sexual assualt.
That's blurring the lines to an unacceptable degree in my opinion. It's becoming my unofficial motto: Liberty can be abridged to an endless extent if we want to base laws on "what if."
So, then you support increased government intervention by making all pornography illegal to possess? What happened to the pro-freedom argument? And, is "fostering lust" illegal? I think not.