Посоветуйте приличную литературу о свободных/открытых отношениях?

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"The Ethical Slut: A Practical Guide to Polyamory, Open Relationships & Other Adventures" by Dossie Easton and Janet W. Hardy"More Than Two: A Practical Guide to Ethical Polyamory" by Franklin Veaux and Eve Rickert"Opening Up: A Guide to Creating and Sustaining Open Relationships" by Tristan Taormino"Polyamory in the 21st Century: Love and Intimacy with Multiple Partners" by Deborah Anapol"Sex at Dawn: How We Mate, Why We Stray, and What It Means for Modern Relationships" by Christopher Ryan and Cacilda Jethá.