when the boomers started having kids of their own, a lot of them felt a sense of almost guilt or shame about how reckless and irresponsible they had been sexually in their teens and 20s, and overcompensated and pushed all of the abstinence only, no premarital sex stuff.  but they eventually realized that didn't work at all, and their millennial kids were just being sneaky and fucking each other anyway, and being even more irresponsible and reckless and ending up with high schools having std outbreaks and 12 year old kids getting pregnant. so the narrative shifted to more of an "ok, kids are going to have sex regardless, just be responsible about it" which led to the return of hookup culture.
United States