Wednesday Martin is a writer and social researcher whose #1 NYT-bestelling book, "The Primates of Park Avenue," revealed the inner world of rich Upper East Side mommies. Now, her anthropologist's eye is turned toward a different type of social currency: sex, erotic capital, cheating, "ethical" non-monogamy, and all things women's sexuality. And she reveals the tricky money conversations that go on inside her own open marriage.