1) Birthrate has been severely impacted by women in the workforce, the social norm changing to allow same-sex marriage, etc. But sure, I'll give you this one as a possible minor factor as there's a lot more to it than that.
2) Despite it's current charming assertion, feminism is wrong on this one: women chose to have less rights as they didn't want the responsibility that followed. That is, to serve in wartime (and yes that was a different time to what we live in now). This affected the ability to vote and own property - certainly if you were unwilling to fight, how could you be expected to be accountable for choosing leadership and protecting your property from brigands and other low lives?
3) Genesis 38:9; God actually killed a man for spilling his seed on the ground instead of taking up his family obligation of propagating further life. Too "subjective"? Ok, according to https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3649591/ the ancient Egyptians had condom-like caps, and the same resource speaks about the sponges that were used at one point too (female side), and douching which was popular at one point. Here's another resource: https://www.verywellhealth.com/the-history-of-condoms-48689
4) That doesn't apply to every country; so it's not a universal factor. As well, we have more jobs than we have people currently in the US. Indeed, some countries give you nothing, others give you more. So... I don't see that as a factor.
Biting the hand that feeds IT
