Note all the despots, the kleptocrats, the desert pashas and feudal princes. A few dominant males reproduce like ferrets. A few high-status females may prosper, too. Most everyone else is a slave, or a reproductive chattel. They are periodically decimated by plague, famine and war, the last often orchestrated by their own leaders to thin their ranks.
Predatory societies lack the time, energy or inclination to overcome such things.
Sexually cooperative cultures do far better. Male cooperators don't have to fritter away energy defending harems against sexually deprived brothers. Female cooperators can spend the energy saved on seduction not only raising healthy children but also doing eye surgery or investment banking. Monogamous cultures, cultures that respect rules of sexual cooperation, are able to go forward from there, and cooperate in other matters. Their science and medicine, their art and their weapons, advance far faster as a result.