Where do we draw the Line between arstistic nude imagery and pornographic imagery?

After much deliberation and a certain understanding, I would like to address the question that we hardly ever ask but has somehow crossed our minds. Where does one draw the line between nude artistic pictures and porn? To some people, any form of nude or slight revealing image would be considered as pornographic material while others would consider a more explicit sexual imagery as fine art. Personally, I feel the differences are based entirely on personal moral and religious beliefs. Kim Kardashian recently went nude for W magazine in the new art issue. This sparked some form of controversy in the same lines. Is it possible to draw the line between the two?

(give your responses in the comment box below)