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#1 Swinging began as a hidden subculture, but by the 1960s, it had become popular among mainly white, affluent heterosexual couples who lived in the suburbs. The media reported on a new phenomenon in the suburbs called wife swapping in the 1950s.

#2 Swingers were initially described as being either recreational or utopian, with the latter being a smaller group of philosophical utopians who dreamed of forming a community and living together.

#3 In 1972, when most discussions about nonmonogamy concerned swinging, Nena and George O'Neill proposed a new relationship model that could include nonmonogamy. Their book Open Marriage: A New Life Style for Couples, based on interviews they conducted as well as their own personal philosophies, sold over 1. 5 million copies.

#4 In 1973, Larry and Joan Constantine coined the term multilateral marriage in their book Group Marriage: A Study of Contemporary Multilateral Marriage. They studied a fairly diverse group of people, and made astute observations about them.