Evolution of breasts

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Here's how to inoculate ourselves against negative ones. Verified by Psychology Today. Sex at Dawn.

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Why do straight men devote so much headspace to those big, bulbous bags of fat drooping from women's chests? Scientists have never satisfactorily explained men's curious breast fixation, but theorists are gonna theorize. Mammary glands are a defining feature of mammals, but humans seem unique in granting mammaries a large sexual role.

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In the primate world, plump breasts last only as long as breastfeeding doesexcept in humans. Women are busty all the time, even after menopause. According to some scientists, the trait is an evolutionary trick for snagging men and signals a woman's ability to feed her children.

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Even Darwin found it a very difficult problem: how could the evolution of breasts that give milk to the new-born have come about? He wrote: "If it could be demonstrated that any complex organ existed, which could not have been formed by numerous, successive, slight, modifications, my theory would absolutely break down. One important piece of evidence is the platypus, a monotreme mammal that has a patch on its breast that secretes milk for its infants to suck.

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Florence Williams gets right to the bosom of her new book in its first line, reeling off names for the most beloved part of the female anatomy: "Funbags. Dingle bobbers. Dairy pillows.

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I'm an animal science student and during our mammogenesis lecture a professor brought up the obvious, but seemingly overlooked notion of the size of the female human breast. Other species do have obvious teats and great apes have breasts, but humans are at the extreme end — obviously not all — but it does make one wonder on a selection and genetic level, why? The full, plump bosom seen in the human ape is an anomaly.

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There are scientific reasons why we've evolved into boob-living human beings — and the reasons date back to our caveman days. And the reason we're so obsessed with boobs isn't because they're used to sell everything from cars to ice cream to beer — although those influences certainly play a factor. Still with me?

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Mate preferences are context-dependent and may vary with different ecological conditions and raters. As predicted, men with higher SOI-R scores unrestricted generally gave higher ratings than did men who scored lower on the SOI-R restrictedbut the difference was significant only at larger breast sizes. We also found that medium to large sizes were rated as the most attractive by both male groups and that viewing angle changed rating of female attractiveness and breast presented in oblique view were rated generally higher than in side view.

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Breasts come in different shapes and sizes, but there's one thing they all have in common: They are unique to humans. More than 5, mammalian species inhabit this planet. Yet Homo sapiens are the only life forms with permanent breasts.

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Please take this quick survey to tell us about what happens after you publish a paper. Human Evolution. Evidence suggests breasts act as signals to males but the critical data required to confirm this are lacking.


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