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Observing a troop in Gombe, Tanzania, Jane Goodall discovered that chimps have personalities, intimate relationships, and agendas. Her work and that of scientists who followed in her footsteps also taught us that chimps are a male-dominant species, prone to not-infrequent violence, with males harassing and sexually coercing lower-ranking female troop members. But our wiring looks less nasty, brutish, and bro-y if we throw over chimps in favor of another close primate relative, the bonobo.

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We often look to the behavior of chimpanzees and bonobos to infer the behavior of our ancestors. For example, male coalitionary aggression in chimpanzees is often taken to indicate violent tendencies in humans. Comparative data on bonobos provide a different picture that emphasizes peace and non-violence.

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Not because this is a ridiculously randy species seriously, any age or sex will suffice. Not even because they, alongside chimpanzees, are the species most closely related to humans. But because they live in what some primatologists believe to be a matriarchy—making them unique among the great apes, including ourselves.

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Functional relationships between the penis, vagina, and cervix during copulation in the chimpanzee were studied. In 11 adult males, penile length during full erection ranged from In 19 parous adult females examined during the early follicular phase of the cycle, or during lactation, vaginal depth from the introitus to the os cervix ranged from 9.

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Though chimpanzees and humans share about 99 percent of the same DNA, numerous physical and behavioral traits separate us from our closest living relatives. But are we different even when it comes to sex? Just how do chimpanzees "do it?

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Anonymous, age and sex unspecified Dear Carole, Why are women so obsessed with the size of a man's cock — wanting ones 6 inches and over and kicking others aside when they really should be concentrating on the emotional connection and love being shared, putting the size of the man's cock right out of her mind? Carole replies: The origins of the primate sex drive go back more than 60m years to the late Mesozoic era when the first primate evolved. A lot of sex has taken place since then, and a significant proportion has been motivated by female choice between rival males.

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Jon Hamilton. Maani, a female chimp in the Budongo Forest in western Uganda. Florian Moellers hide caption.

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Bonobos and chimpanzees diverged from each other around 2 million years ago and differ in morphology, behavior, and perhaps even emotions and cognition in important ways. Bonobos are female dominant, with females forming tight bonds against males through same-sex socio-sexual contact that is thought to limit aggression. In the wild, they have not been seen to cooperatively hunt, use tools, or exhibit lethal aggression. Chimpanzees are male dominant, with intense aggression between different groups that can be lethal.

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Please take this quick survey to tell us about what happens after you publish a paper. Human Nature. The evolution of nonconceptive sexuality in bonobos and chimpanzees is discussed from a functional perspective.

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Sexual swellings are enlarged areas of genital and perineal skin occurring in some female primates that vary in size over the course of the menstrual cycle. Though heavily investigated, the ultimate function of sexual swellings remains unknown. Alone, however, no single hypothesis is believed to account for the function of sexual swellings; a combination of these theories may be more appropriate.


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