What's the easiest way of saying this? Humans rationally pursue kin-selective behavior as the goal of economic behavior. Men and women have different opportunity costs for offspring and revenues from offspring. What is a rational action for one can be and often is irrational for the other. The same is true for parents and non-parents plus various other differences. The policy model of Economic Man is too simplified to be anywhere near as useful as it is assumed to be. Is this something you would be able to understand as a book blurb?