Do anatomicaly correct drawings in a textbook qualify as porn? Or is it erotica?  For that matter, I seem to recall getting excited over the latest issue of Fredericks of Hollywood, when they used drawings and paintings.  Is that porn, erotica or just catalog art? 

Back to the textbook question.  If the drawing depicts the innerworkings of sex, is that porn?  If it isn't, then if that same textbook used photos instead of drawings to show the same thing, is that porn?

We as americans, as a whole tend to be very prudish about these things in the open, but in private it's another story.

I believe the Japanese have a saying that goes something like this, "Nudity is often seen, but rarely looked at."