We don't need a reminder from HBO's Girls that we've become fairly open with talking about sex. Except, perhaps, when it's parent sex. Nobody wants to talk about parents having sex. Not me, not you, not the next person.
Given Girls' obsession with touching on any and all taboo topics, particularly as they relate to the bedroom, the steamy scene in which Hannah's parents - who seem to have a very healthy, happy, 30-year-long marriage - fornicate comes as no surprise.