Fewer children, smaller families

[Wounded Bear]

2. Actually, those things are a normal byproduct of advanced societies...

Modern, progressive societies allow more women (and men, frankly) to make career and lifestyle choices that often bypass childbearing.

We don't need families with 15 children, mostly because half of them don't die in infancy and childhood like they did in the 18th Century.

You are not at all wrong about the "sex is only for making babies" crowd.