I have a couple of former co-workers (now in their 70s) who used to tell stories endlessly about their teenage sexcapades back in the mid-1950s. Some were with the local “bad girls” and others were with the daughters of prominent citizens (the mayor, judges, etc.) I don't know exactly when the “sexual revolution” started, but it was apparently well underway before the 1960s.
I’m pretty sure it started with that Adam and Eve couple...
Of course, maybe they were feeding you a bunch of crap.