While the sexy photo tradition dates all the way back to the 1890s, things took off with the pinup girls of the '40s and '50s. During WWII, the boys overseas hung the girls' pictures in their lockers, and the rest is history. Many of these beauties, like Sophia Loren and Veronica Lake, went on to have successful careers in film. Pinup girls celebrated their bodies, showed some skin, and weren't afraid to work the camera. They are truly timeless sex symbols. See some of our favorites now.