2
The changes of the sex revolution were terrible.
Didnt help that internet grew (and that means porn, video games, social media).
Those are two time periods where the fertility rates fell significantly.
In Europe
1960 rates were 2.5 -3 per couple
1980 drops to 2 on average
2010-2020 to 1.5 on average.
There are also some economic problems (depending on the country)
Generally speaking id say 1)contraceptives for both sexes 2)porn for men 3)female higher education
were the leading culprits.
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