For several reasons, mother-son incest is the most interesting reproductive system from an evolutionary perspective. We will first examine its advantage in terms of population growth.
Let's assume there are two populations. On one side, there are 1,000 women, whom we'll call the Jocastas; on the other, there are 100,000 people, 50% men and 50% women, whom we'll call the Commons.
The Jocastas each have a son, with whom they will reproduce once he reaches adulthood. Mother-son couples have an average of 3.6 children per woman, which is a high birth rate. The daughters of these couples will also have a son with whom they will start a large family.
The Commons have a much lower birth rate, around 1.6 children per woman. This rate remains constant across generations.
Taking into account the population replacement rate, mortality rate, male-female distribution, and other details, we arrive at some interesting results after the 10th generation.
For the Jocasta group, the number of theoretical individuals increased from 1,000 to 92,019. Its percentage of the total population increased from 1% to 76.6%.
For the Commons group, the number of theoretical individuals increased from 100,000 to 28,216. Its percentage of the total population decreased from 99% to 23.5%.
Our modern societies are experiencing a problem of demographic decline. Don't you want to ensure the survival of your offspring by taking your mother as a wife?
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