The Evolutionary Advantage of Sexual Restriction

There are strategies in terms of how sexually restrictive different groups and cultures are. It has an evolutionary advantage. If you have a group which uses restrictive sexual strategies, like monogamy, for example, and other people in your community don't follow the same rules, it reduces the reproductive fitness of the people who do follow the rules. As promiscuity increases in a group where some of the people are following restrictive strategies, it creates greater risk for the males to have their wives potentially impregnated by other people or for women to lose their access to resources if their husband decides to leave them for someone else. So there is an evolutionary basis to some of the things that we consider morality around these activities. So that I thought was really fascinating as an actual evolutionary strategy.