Wired has produced a nice graph, showing the disparity between real body shapes and the ones seen in porn. Back in 1954, regular women were skinnier, and playmates were curvier...but over the decades, those two lines have diverged in such a way that I predict a new species will be described to identify these strange, bony, busty women who men so strangely lust after, despite their resemblance, from the back, to be a young boy.