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The Second Wave of Consensual Nonmonogamy in the U.S.

a protest march in the street in the 1970s
“Swinging, group marriages, communes, and polyamorous communities all contributed to the burgeoning second wave of CNM in the United States in the 1960s and 70s. In the 1980s the sexual revolution collided with the spread of AIDS and other sexually transmitted infections, and the resulting backlash drove discussion of group sex and multiple partners out of mainstream society. Academic research on sexually non-exclusive relationships dwindled significantly during this period. Although very few such studies were published during the 1980s and 1990s, the practice of consensually non-monogamous relationships endured. Only a decade later, the first inklings of Internet communications began to spark new life in CNM communities in the U.S.”

https://www.psychologytoday.com/us/blog/the-polyamorists-next-door/202204/the-second-wave-consensual-nonmonogamy-in-the-us