Every time I sing a song, I'm actually making love on stage. Call me 'The Boudoir Singer, ' or so claimed Frank Sinatra. The crooner's career spanned more than half a century, earning him millions of fans. His boudoir conquests involved some of the most stunning women of the 20th century. But exactly who was this mercurial, enigmatic man? Darwin Porter, America's leading chronicler of Golden Age Hollywood, turns over more than a few boulders in Sinatra's...