On a recent episode of Curb Your Enthusiasm, Larry David decides to invest in an inventor’s idea because the guy’s wife is unattractive. Later in the episode, he fires his business manager because the man’s wife is too attractive. David’s thinking is that men married to sexy women are superficial and therefore untrustworthy. On the other hand, if a man marries a woman based solely on her personality and not physical appearance, that guy must be genuine.
I think Petraeus was using this theory…probably got him up in the ranks.