Well, think about it from a biological standpoint. Women are sorta pre-wired from the factory to raise and nurture, it's been a successful blueprint for survival for along time running. Once the kids are grown up and out of the house those nurturing proclivities seek a re-purposing...or other such similar circumstances.
I'm not saying that barefoot and preggers is the proper or correct path for everyone. I'm simply referencing what has typically been the norm for humanity.
Never cook bacon while naked.