>This is the 21st century. Are we really still talking about "natural imperatives"?

I do think that "imperative" is a little strong. But males are biologically different from females in all species, and in all species this translates into behavioral differences. There's no such thing as a species where males and females don't show behavioral differences, and in particular in regards to mating behavior and reproduction.

Certainly humans, as a whole, in first world countries are failing to mate effectively. Children are being had later or not at all. But women still show a comparatively greater interest, despite this overall trend. It would be foolish to claim that the 21st century has made natural behavioral differences irrelevant.