From an evolutionary (Darwinian) point of view, we could say that the genes that created organisms that did not care about the implementation of the above optimal reproductive strategy, and these organisms do not co-exist with us. They were culled by natural selection. Like Organisms and as people, we are the products of the competition between the two different genes, the competition, which is the struggle for survival. This competition requires that we - women and men - took care of our own offspring and were interested in the optimal mating strategies which, however, are different for women and men. Based on this, we should expect that women tend to be more prone to stable relations than men. We can expect from both sexes, a fundamental interest in the welfare of posterity. At the same time, we could assume that the "optimal" strategy should connect men fertility in safe conditions of his upbringing in the framework of sustainable relationships with children in other families. For example, rich people can benefit from the presence of several wives at the same time (the traditional polygamy) or change their wives, in which each successive wife is younger than the previous one (as is quite common in our modern society, permitted divorce).