The low rates of physical teenage sex in the west today are a result of a generation of social liberalism along with technological progress (enabling virtual means to explore one's sexuality). Social liberalism means having a healthy attitude towards sex and gender and being able to talk about them freely, not treating them as taboo subjects.
Low birth rates in the US and EU are a direct result of socially conservative public policy, where having kids generally means one's standard of living goes down. France has the best child support and consequently the highest birth rates in the EU.
Low birth rates in the US and EU are a direct result of socially conservative public policy, where having kids generally means one's standard of living goes down. France has the best child support and consequently the highest birth rates in the EU.