America's entrance into World War II back in 1941 triggered the golden age of pinups, pictures of smiling women in a range of clothing-challenged situations. The racy photos adorned lonely servicemen's lockers, the walls of barracks, and even the sides of planes. For the first time in its history, the US military unofficially sanctioned this kind of art: pinup pictures, magazines, and calendars were shipped and distributed among the troops, often at government expense, to "raise morale" and...