Facepalm

Others have hammered on how incorrect this is but I do want to point one thing out

the female needs her mate to stick around and care for her and her child during pregnancy through early child rearing

This is assuming a 1950s style atomic family unit which is an extremely new concept. Evidence suggests our shared pre-agriculture ancestors lived in small hunter gatherer groups. These groups would share responsibilities, like a family, but not necessarily all be closely related. "it takes a village to raise a child" and everything.