I myself was introduced to real sex through careful closeted reading of "The Sexual Behavior of the Lesbian" -- basically, a pron work thinly disguised as a scientific manual. Paperback with steamy pictures.
Now Carrol and Ken may have a point in talking about the newness of porn as a stand-alone "genre" (why does genre seem misapplied to porn)...but I just don't see how that makes porn which predates Sade not porn. Now, having read Sade, cover to cover, I also need to say that he himself did not think he was writing porn, but philosophy. And, put in the context of 18th century Rousseauian nature worship, it is philosophical in some very interesting ways. For those of you who don't believe me. Try reading "Justine."
Joanna