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Is man a monogamous species?
First, they have a smaller fang size. Secondly, the uprightness is developing. And thirdly, most likely, at the same time, such a unique feature of a person as latent ovulation begins to form. If we assume that all these things evolved in a complex, then the following (simplified) picture emerges.
Female Ardipitheca actively use the opportunity to take from the males food in exchange for sex. The more food, the more cubs can be grown. In this regard, the evolutionary advantage is obtained by those who can have sex, regardless of the stage of the cycle, a feature that is completely uncharacteristic of any mammal, except for a person. At the same time it is profitable for a male to bring a lot of food - he will increase his reproductive success, having conceived more children. This contributes to the development of the upright - simply because to carry a bunch of food over a long distance is much more comfortable in the hands than in the teeth. On the other hand, if a female can now give birth to babies more often, then it is also convenient for her to release her hands in order to manage several babies at once.
At some point, probably, the evolutionary advantage of those males and females, who tend not only to enter into commodity-money relations with anyone horrible, but to form stable pairs. The female will eventually grow more descendants if she has one, but a constant earner. The male will spend his resources on the production of food for that particular female who is raising his children. But in order for this connection to be stable, it is necessary to finally get rid of the external signs of ovulation.
In almost all animals, the female actively demonstrates to its surrounding males its readiness for conception - arching its back, bends, its labia nibs swelling and moisturizing, its odor changes; Chimpanzees and bonobos use special sex leather to attract males. "It is huge and pink, as a traffic light, it signals the ability of the female to conceive in such a way that it can be seen in a kilometer," - says this biologist Alexander Markov, who read the book in the manuscript.
The human ancestors, it all becomes terribly unprofitable. How does the female beg for food from the male, if he sees that conception is impossible now? How can a male be sure that his children, if during the ovulation for the female runs the whole herd? And it turns out that the most caring husbands are now obtained from those males who do not know how to determine ovulation, and the most faithful wives are of those females that hide their ability to fertilize as much as possible (for example, keep the breast size more or less constant regardless of the cycle phase and age of calves). In parallel, the ability to mate at any time, regardless of the stage of maturation of eggs, is fixed, because sex is now needed for the female not only for conception, but also for procorm (and also it is needed to strengthen attachment between monogamous partners - then the psychoactive role of oxytocin and other hormones associated with sexual pleasure).
Now that the ardipithees have matured before the formation of stable pairs, males can devote far less forces to intraspecific competition: dividing females is simpler and more convenient than competing for them during each ovulation. On the other hand, females now prefer to marry the most caring males, which means giving birth to caring and non-aggressive sons. As a result of these factors, the size of the canines begins to decrease progressively (monkeys use them to demonstrate intraspecies aggression) and increase the ability of males to act together, for example, raids for food. And from there it is already a direct road to the development of speech, military operations and football.
You can say as much as you like that the person created labor, or meat-eating, or selection for infantilism, or uranium ores in Africa, or near-water life, - there are still many complementary hypotheses of varying degrees of scientific and validity. But most of all I like the idea of Lovejoy in her simplistic retelling: "Man created sex". And then, again, love took part, of course, where without it.
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Is man a monogamous species?
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