The social role of fatherhood is not biological, that is why we see many societies where the biological father doesn't exist (example: the Mosuo) but no societies where the biological mother doesn't exist.

The norm for the hunters-gatherers was probably not that one man provided for one woman. It was that all men provided for all of the children of the tribe. The concept of the biological father generally didn't exist as we know it today.

I think this is an important thing to keep in mind when considering the sexual dynamics and where society is going in terms of fatherhood. My prediction is that soon the concept of the biological father will cease to exist almost entirely in western societies, especially if something like UBI is provided by the state.