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Why do you need such a big dick?

No, no one forced the experimental women to consistently have sex with two men. Students were only interrogated whether they once suspected their girlfriend of infidelity (or were they once girls in such a situation), whether there was sex in this period and how he differed from ordinary sex in a couple. In another study, the question was simpler - how does sex change after separation. The absolute majority of the participants reported that in both of these situations the frictions were faster and deeper. It can be easily assumed that this is due not only to the emotional reaction to the partner, but also to the unconscious desire to smooth out the consequences of possible infidelity - to minimize the likelihood of conceiving a child from an outsider.
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 sex life have been formed in connection with the arms race between changing women and their jealous husbands. Ridley cites the work of Baker and Bellis, dedicated to the fact that, firstly, women are more likely to change their husbands in the period of maximum likelihood of conception; secondly, that the female orgasm, which occurred simultaneously with male ejaculation or soon after it, increases the amount of sperm remaining in the genital tract of a woman, and such orgasms women often experience with lovers than with 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 field of vision all day. All this is quite old work, and I could not find the original sources, so the above information went through a double popularization distortion. But still sounds great.
All these data do not contradict Lovejoy's hypothesis about our monogamy. First, he did not claim that all females always remained faithful, and secondly, described a time-limited piece of our history - before and after it evolution did not stop. But you can try to explain the large size of the penis and without the involvement of marital infidelity. To do this, we need a hypothesis about the near-water way of life of human ancestors, popularized by Ian Lindblad in the book "You, I and the Primordial". The point is that some part of our evolutionary path could take place on the coast, in constant contact with water, and from this we had a upright (to go deeper into the water), hairlessness in combination with a thick layer of subcutaneous fat (like whales), developed lips and tongue (to suck out seashells), directed down nostrils (not to choke), swimming reflex in infants, and also a long penis (to prevent sperm washing out during water sex). This hypothesis is not scientific, it does not have any paleontological evidence, and to mention it in a decent society is therefore not recommended. But in a society that does not consist of evolutionary biologists, its retelling usually produces a furor - due to the simplicity of the presentation and an entertaining collective search for new arguments for and against.
There is also a second group of explanations of why a person has a large penis. It is assumed that there is no direct benefit to conception in this, but this body is simply like the females and for hundreds of thousands of years they preferred men with larger penises, they were less likely to change and give birth to more children from them. Unfortunately, we still have no way to go 3.2 million years into the past, find Lucy (the most famous female Australopithecus, named after the song "Lucy in the Sky with Diamonds") and ask her about sexual preferences - especially given that she could not speak yet. The only thing that remains for us 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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