What Is The Evolutionary Explanation For Mating Patterns And Promiscuity?

What Is The Evolutionary Explanation For Mating Patterns And Promiscuity? Under assumed ancestral human conditions, we find that male mate guarding, rather than paternal care, drives the evolution of monogamy, as it secures a partner and ensures paternity certainty in the face of more promiscuous competitors. What type of factors would lead to the evolution