What do you think if I told you that one very celebrated modern greek poet has written a multi-tome epic that depicts constantly graphic sexual scenes with very young girls? Or that other great greek poets, including nobel prized Elytis, often mention nubible nude young girls dancing around carelessly and sometimes describing vividly their charms in their poems?
I guess it should be ok because its just text and unlike photography, no actual model took part in the creation, but then again books have been banned for their content and authors held responsible.
We might live under different societies, but can't see many being mature and well behaved enough that Nobokov couldn't be held responsible the actions of his readers...