Showtime’s The L Word: Generation Q is usually a love letter to left-wing hedonism, promoting a radical matriarchal vision of sexual revolution. (I say “matriarchal” because straight men do not exist in the show except as villains or annoyances who briefly pop in and out now and again.) That is why it was surprising to see the show spotlight the heartbeat of an unborn child in this week’s episode, “Lose it All,” on January 19.