I actually remember this quote by Gloria Leonard as saying - "The difference between pornography and art is lighting". Only when I re-googled the quote did I notice that it said erotica, not art. It works either way I think.
So whats the relationship between pornography and art? Its of course more than simply employing different lighting techniques. I think the work of Robert Mapplethorpe and Caravaggio make for a good study on what defines or separates art, erotica or pornography.
I have to go and cook some dinner.
My little sketch on the right is neither art nor pornography. It's just a sketch of a woman, glazed over by a colourful lens flare. I don't even know her name.