Porfirio Rubirosa was the last great playboy: a symbol of powerful masculinity, ubiquity, and easy-come-easy-go money. He had an eye for beautiful women, particularly when they came with great wealth: he managed to marry two of the richest women on the planet. Rumor had him bedding hundreds of others, including Christina Onassis, Eva Perón, and Zsa Zsa Gabor. But he was a man's man, too, chumming around with the likes of Joe Kennedy, Frank Sinatra,...