>>11945953Simple. There exist three possible sex strategies that animals organized in social groups may engage in.
1. Monogamy, where there is a one-to-one bonding, often permanent, thus guaranteeing that the father cares for its own biological child.
2. Promiscuity, often seen in species with a strong tendency to infanticide, where there is a many-to-many bonding, obfuscating paternity.
3. Harem, where there is a many-to-one bonding. Often seen in species who are organized in a hierarchy and compete against each other because of resource constraints. The dominating male controls most of the resources, thus enabling him not only to father many children but to provide for many females as well. This is in fact the sexual strategy originally employed by humans.