(This is a part from the new draft of the ‘guide for the young patriarch.’ I deleted the older version of the guide and will publish here parts of the new version of the guide as I progress. The new version of the guide is written in a form based on informal logic.)
Premise 1: All genes seek reproduction.
Premise 2: The reproductive systems of men and women are not identical.
Contention 1, based on premise 1 and premise 2: Differences in biology would yield differences in the set of behaviors between men and women to optimize reproductive success.
Premise 3: Men do not have certainty of paternity, women have.
Contention 2, based on premise 3 and premise 1: Men will be less devoted to their children compared with women.
Corollary 1 to Contention 2: Paternity testing for multiple generations, enough to influence evolution, will make men more devoted parents.
Premise 4: Sex is biologically cheap for men, compared with women (pregnancy and childbirth vs. sperm).
Contention 3, based on premise 4 and premise 1: Sex is a better biological deal for men compared with women.
Corollary 1 to Contention 3: Men will prioritize quantity of lovers (more good deals, sperm is cheap) while women will prioritize the quality of their lovers (get best deal for the high price paid for sex).
Corollary 2 to Contention 3: Since sex is a better deal for men, women can demand resources (provider to assist in raising the children), or demand the men to be more attractive (hypergamy) to compensate the gap in biological price paid for sex.