33. Elizabeth and Philip Jennings, 'The Americans'
Everyone knows misery loves company; misery's lust for company, however, receives comparatively little airtime. That's where the deep-cover KGB agents who pose as the couple next door in this riveting Cold War thriller come in: Their job of lying, killing, and potentially dying for their secret Soviet backers is made bearable only by their intense sexual connection. Actors Matthew Rhys and Keri Russell, who kindled an IRL relationship while playing the roles, have given TV one of its saddest and sexiest couples of all time.