Essays and essays from other countries The Pursuit of Reproduction and Pleasure and the Future SEX 2 billion Year History / David Baker / Shigeo Sometaya

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Essays and Essays from Other Countries How did the first sex begin? Why do we have diverse sexual behaviors? A book of intellectual adventures that crosses the point of view of evolutionary history and cultural history of organisms and travels for 2,000,000,000 years from the age of microorganisms to the present. It is said that this is the origin of sex. Until then, the whole earth was frozen by the "snowball earth" phenomenon, in which the whole earth including near the equator froze. Until then, microorganisms were only able to clone themselves by asexual reproduction, but they became eucaryotes that retain their DNAs in their intracellular nuclei to protect their DNAs, and they fused each other's DNAs to create offspring that can withstand harsh environments. It is said that this is the origin of sex. After that, sex based on the timeline of human evolution became diversified. The genitals inside the body came out of the body and changed in shape and size. When it comes to primates, there was a patriarchal system dominated by males and a patriarchal system centered on females appeared. In addition, "attractive factors" to appeal to people of the opposite sex varied depending on the species. As evolution advanced to the human race, sex also changes according to the hunter-gatherer society, agrarian society and environment. And the present age. Various sexual preferences and instincts behind sexual behavior also lead to "ancestors" hundreds of millions of years ago if you trace history. When evolution advanced to the human race, sex also changes according to the hunter-gatherer society, agricultural society and environment. And the present age. Various sexual preferences and instincts behind sexual behavior also lead to "ancestors" hundreds of millions of years ago. When evolution advanced to the human race, sex also changes according to the hunter-gatherer society, agricultural society and environment. When evolution advanced to the human race, sex also changes according to the history. And the present age. Various sexual preferences and instincts behind sexual behavior also lead to "ancestors" hundreds of millions of years ago. When evolution advanced to the human race, sex also changes according to the history. And the modern age. A chimpanzee from Mars, a bonobo from Venus 7 starting erect (orgasm) 5 monkey business 6 chimpanzee from Mars, bonobo from Venus 7 starting erect (elektu) 5 monkey business 6 chimpanzee from Mars, bonobo from Venus 7 starting erect (elektu) 5 monkey business 6 chimpanzee from Mars, bonobo from Venus 7 starting erect (elektu) 5 monkey business 6 chimpanzee from Mars, bonobo from Venus 7 starting erect (elektu) 5 monkey business 6 chimpanzee from Mars, bonobo from Venus 7 starting erect (elektu) 5 monkey business 6 chimpanzee from Mars, bonobo from Venus 7 starting erect (elektu) 8 forest 9 sex and civilization 10 modern revolution 11 the future of 2,000,000,000 davidcanzuk 『 』 『 』 Tyrannosaurus