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In the 1970s changes in public health policy and a further opening in sexual mores resulted in a perception that STD were dramatically increasing. this was compounded when AIDS/HIV emerged at the end of the decade.
Assuming HIV/AIDS does not emerge, and the reality becomes STD are further suppressed during the 1970s how are North American sexual practices going to develop? My first take is the Swapper subculture & related swinger thing continue to grow & become somewhat more accepted. That is spouse swapping is less of a underground thing & undergoes less of a retrenchment in the 1980s.
Obviously there rare a lot of other things affected here, which I'll leave for others for the moment.