> ... porn [is a normal part] of a healthy, adult sexuality
This is the kind of statement that should really be carefully evaluated. Smoking was "normal" once, too, along with many other unsavory bits of culture we have now moved on from.
I followed your link and could not find any studies cited in the article that back up the claims made (not saying there aren't any, just that I couldn't find any in the article). Most of it hinges on a self reported survey conducted once in Italy.
Basically, show some solid evidence. Otherwise it would seem that you are taking a moral position on this, not a scientific one.
I think the the "normalcy" of smoking is much more similar to how the suppression and shaming of normal sexuality was, until relatively recently, the norm in modern western civilization.
IMHO, the article you linked to is about as enlightening as an article saying that overindulgence in cakes and cookies is harmful. Well duh! In normal, moderate consumption both cakes, cookies, and porn are completely normal and healthy.
Basically, show some solid evidence. Otherwise it would seem that you are taking a moral position on this, not a scientific one.