The Lesbian Polyamory Reader: Open Relationships, Non-Monogamy and Casual Sex** edited by Marcia Munson and Judith P. Stelboum – A bit uneven and random as far as collections go, this anthology nonetheless contains a few real gems and lots of insights specific to dyke (and other sorts of queer) relationships that you won’t find elsewhere. The pieces on confronting one’s biphobia and dealing with how scary lots of love can be are especially good.
The Lifestyle: A Look at the Erotic Rites of Swingers** by Terry Gould – Swinger propaganda extraordinaire, and as such not so politically appealing for the likes of me, but nonetheless very educational about swinger culture.
Hot Monogamy: Essential Steps to More Passionate, Intimate Lovemaking by Patricia Love and Jo Robinson – If you decide that this poly thing isn’t for you, this is a good place to start doing conscious monogamy well. Note that the book does presume that monogamy is inherently “better.”