[rayiner]

Women not only do, but express the preference to, stay home with kids at much higher rates than men. It's quite likely there is a biological reason for that, and that the social construct derives from that instead of the other way around.

The fact that some women don't want to stay home and some men do doesn't mean it's a social construct. Many biologically-rooted differences between men and women are expressed in the population as overlapping but not coextensive normal distributions. E.g. https://link.springer.com/article/10.1007/s00421-006-0351-1