You’re correct. All this talk about when people choose to have kids over-intellectualizes that what is a biological function. My wife and I have three kids. I’m not sure you can say any of them resulted from a rigorous analysis. We had our first in law school as a happy surprise. We theoretically planned our second and third, a six year gap after the first. But that the timing coincided with moving from an apartment to a house. We weren’t thinking about more kids when we moved—we wanted to take advantage of good interest rates. But my wife observed later that the availability of more space for kids probably subconsciously influenced our decision to have more.
When talking about hormone disruption, I think people over-focus on how that affects the ability to have kids. But that overlooks how hormones can change behaviors and desires. I don’t see anyone rebutting the fact that testosterone levels in prime-age men have dropped by half compared to the 1960s. Yet nobody seems to be talking about that as a probable cause in the drop in fertility rates. Even if these men are technically able to have kids if they want. Is it possible that the drop in testosterone levels means that men are less interested in having kids, and perhaps less able to persuade women into doing so?