What are your thoughts on.....

When does something move from being pornographic to artistic? When does the naked body just photograph as art or a canvas change to being dirty? I've spent a lot of time in Europe, lived in London for 4 1/2 years. The nakedness of ones body is embraced. It isn't used to exploit except to the Westerners. I just wonder if it's our culture or a sign of the times?

I welcome any and ALL responses.