Households consist of mother and children. Intense competition between men for access to sex. Most people engage in monogamy. A few powerful males are allowed to have multiple wives. Monogamy and patriarchy are connected.
Patriarchal privilege is one of the glues used to bind men to marriage as an institution.
If men are absent from the home, they lose the opportunity of being dominant there. According to the classical tradition, objective value is rooted in human nature, prior to our choices and actions. We exist within a framework of values and norms that are prior to and independent of our wills. There are no objective norms or values to constrain us, with authority over us. We are still free as a society to decide whether to alter, exaggerate or eliminate these differences.