This is just about the girls in the 1950s who went to bars with paper bags containing toiletries, looking for a guy to go home with. This was a regular enough occurrence that one can find it described in popular literature of the era. The 1950s was not really a time of sexual continence, as conservatives frequently like to pretend (the major liberal lie of the 1950s is ignoring the massive amount of tax avoidance behavior that resulted from sky-high tax rates). There is in fact a grain of truth to the idea that the 1950s was about a facade of cleanliness hiding rot.
The 1950s was a strange time, as it was when atomicity started to become widespread and community ties started to openly degrade. It’s also a time that due ironically to being the first mass media decade has managed to ensconce itself in conservative and liberal memetic memory as the perfect decade, for essentially similar reasons (that people were more willing to sacrifice temporal pleasure for the common good). For liberals, this sacrifice is financial, while it is sexual and social for the conservatives. It’s also totally imaginary in both cases, except by pure accident.
After all, it’s the children who were raised by people who were adults (and sometimes paper bag girls and men amenable to taking them home) during the 50s who are running most of our institutions into the ground right now. If the adults were so much more moral, why are their children so venal?