Reddit reviews Swinging in America: Love, Sex, and Marriage in the 21st Century

• The Swinging Paradigm: An Evaluation of the Marital and Sexual Satisfaction of Swingers, Electronic Journal of Human Sexuality
  
  
• Today's Alternative Marriage Styles: The Case of Swingers, Electronic Journal of Human Sexuality
  
  
• Permission To Cheat: Ethnography of a Swingers’ Convention, Sexuality & Culture
  
  
• From Fantasy to Reality: A Grounded Theory of Experiences in the Swinging Lifestyle, Archives of Sexual Behavior
  
  
• Can Swingers Have a Happy Marriage? Yes, but don't count on swinging to save a bad one, Psychology Today
  
  
• Are Swingers Freaky and Deviant The evolution of consensual non-monogamy in America, Psychology Today
  
  
• Swinging in America: Love, Sex, and Marriage in the 21st Century, by Curtis R. Bergstrand
  
  
• Sex at Dawn: How We Mate, Why We Stray, and What It Means for Modern Relationships, by Christopher Ryan & Cacilda Jetha
  

Swinging in America by Curtis R. Bergstrand and Jennifer Blevins Sinski is another good one. http://www.amazon.com/Swinging-America-Love-Marriage-Century/dp/0313379661/ref=la_B002QK30IQ_1_1?s=books&ie=UTF8&qid=1407366961&sr=1-1