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Why do you need such a big dick?
No, no one forced experimental women to consistently have sex with two men. The students were only asked if they had once suspected their girlfriend of infidelity (or if they were once girls in such a situation), whether sex was in this period and how it differed from regular sex in a couple. In another study, the question was easier - how sex changes after separation. The absolute majority of participants reported that in both of these situations the frictions were faster and deeper. It can easily be assumed that this is connected not only with the emotional reaction to the partner, but also with the unconscious desire to smooth out the consequences of possible adultery - to minimize the likelihood of conceiving a child from an outsider man.
Matt Ridley’s book Sex and the Evolution of Human Nature mentions several more arguments in favor of the hypothesis that certain features of our sexual life were formed in connection with the arms race between cheating women and their jealous husbands. Ridley quotes the work of Baker and Bellis on the fact that, firstly, women are more inclined to cheat on their husbands during the period of the maximum probability of conception; secondly, that female orgasm, which occurred simultaneously with male ejaculation or shortly after it, increases the amount of sperm remaining in the genital tract of a woman, and such orgasms are more often experienced by women with lovers than with their husbands; and finally, both male and male rats produce more sperm during sex, if they have reason to believe that the female could meet with another man, and was not in their sight all day. All this is quite old work, and I was not able to find the original sources, so the above information went through a double popularization distortion. But it still sounds great.
All these data do not contradict Lovejoy's hypothesis about our monogamy. Firstly, he did not claim that all females always observed loyalty, and secondly, he described a time-limited piece of our history — before and after him, evolution did not stop. But you can try to explain the large size of a member without attracting adultery. To do this, we need a hypothesis about the near-water lifestyle of human ancestors, popularized by Jan Lindblad in the book You, Me and the Primordial. The point is that some part of our evolutionary path could occur on the coast, in constant contact with water, and from this we have erect (to go deeper into the water), hairlessness combined with a thick layer of subcutaneous fat ( whales), developed lips and tongue (to suck up shells), pointing down the nostrils (not to drown), swimming reflex in babies, and a long penis (to prevent water from washing out during sex). This hypothesis is not scientific, it does not have any paleontological evidence, and therefore it is not recommended to mention it in a decent society. But on the other hand, in a society not made up of evolutionary biologists, retelling is usually a sensation, thanks to the simplicity of presentation and the entertaining collective search for new arguments for and against.
There is also a second group of explanations for why a person has a big penis. It is assumed that there is no direct benefit for conception in this, but on the other hand, this organ is simply liked by females and for hundreds of thousands of years they preferred men with larger penises, less often they were changed and more children gave birth to them. Unfortunately, we still have no way to go 3.2 million years into the past, find Lucy there (the most famous Australopithecus female, named after the song “Lucy in the Sky with Diamonds'”) and ask her about sexual preferences - especially given the fact that she did not know how to speak. The only thing that remains is to try to understand how modern women relate to the size of the penis.
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Why do you need such a big dick?
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