1970's - pass a law that makes sex without consequences desirable.
1970-2022 - have all mass media promote every kind of free-sex culture you can, even all kinds of deviant crap.

2022 - remove a key ruling that should never have happened in the first place.

Result: all the whores who grew up thinking they SHOULD have as much sex as possible freak out when they realize they might have to deal with consequences.
Except not really, you can still go somewhere and murder your baby.