Indulge me for a moment. You don’t have to agree with every word, but hear me out.
The availability of casual sex without marriage, fatherhood, commitment, etc. has weakened men. It has made men slippery, less capable of commitment, more prone to dishonesty- generally, less attractive to women.
Giving up casual sex has made women more emotionally confused, less authentic, less happy. Case in point, the Aziz Ansari story.
The result? Fewer marriages, families, relationships. An embrace of atheism and hedonism over all else. And the decline of families.