Good point (though I'm sure there are folks who will argue it).  Whether you'd want to include the erotic & romance novels in this is part of the same argument.

Would suggest changing the message for porn-mags though: something along the lines of "You find this collection of prey mating-displays mildly amusing at best."

(Feel free to tweak that.  The important part is that post-Threshold mutations such as Sapiovore alter the character's perceptions and thoughts, to the point where the UI reflects it.)