Just because someone poses nude in a photograph, it doesn't automatically make that photograph 'porn', amirite?
I've found that many Artistic Nude photographs are being pornography, especially on deviantART (a website that welcomes artists of all kinds, including artistic nude photographers) where they are submitted daily. I'm not saying I pose naked, nor do I take pictures of naked people, but there is a huge difference from taking a picture of a naked woman/man, to taking a picture of naked woman/man.
If you don't understand what I mean... I mean that being naked don't make someone a porn star. But doing specific tasks/poses/whatever can probably mean the opposite. End of discussion. I'm out.