Butt is it Art?

Multimedia artist Jeff Koons and his ex-wife, Italian porn star/politician Ciccolina turned heads in the early 90s with a series of sexy self-portraits of the daring duo in various states of copulation.
In this piece, entitled Silver Shoes we see the erstwhile couple in a more "relaxed" state than some of the other works of art–which feature all sorts of penetration. I could never tell if this was a photo or a painting, either way it's quite revealing!