Opening Up: A Guide to Creating and Sustaining Open Relationships by Tristan Taormino is a perennial seller. So is The Ethical Slut, a how-to for the woman who wants to get sex outside of monogamy in a way that is principled, nay virtuous (it seemed all my divorced girlfriends and friends in their twenties were reading it). In The New Monogamy, Tammy Nelson, a guru for those who struggle with the issue of sexual exclusivity, deftly redefines monogamy as a frequently difficult practice, like yoga, that requires commitment.
