“Threesomes suddenly seem to be everywhere, although the message about them is paradoxical: Everyone (at least everyone male) wants to have one, but no one's had a good one. A friend says he bedded two women on the night of September 11, 2001, as they all watched television together. But — as in many stories I hear — there's an imbalance. One of the women had a serious, unreciprocated crush on him. 'Inside every threesome is a twosome and a onesome,' a character on Gossip Girl warns.”