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The penis bone, otherwise known as the 'baculum', is present in all primates aside from humans. By Luis Villazon. It seems to have evolved independently nine times in different mammal lineages but it has also subsequently been lost in many cases.

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You can all stop worrying about size, guys. Compared to our primate cousins, humans have the longest penis, a new video explains. Dangly Bits.

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Despite slang terms that imply otherwise, the human penis contains no bones. The same cannot be said for many of our closest evolutionary relatives: Chimpanzees and bonobos both have penis bones a macaque one is picturedalso known as bacula. That means it was present in the most recent common ancestor of all primates and carnivores.

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This page has been archived and is no longer updated. Published online 9 March Nature doi Sex would be a very different proposition for humans if — like some animals including chimpanzees, macaques and mice — men had penises studded with small, hard spines.

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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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Human penises vary in size on a number of measures, including length and circumference when flaccid and erect. Besides the natural variability of human penises in general, there are factors that lead to minor variations in a particular male, such as the level of arousaltime of day, room temperature, and frequency of sexual activity. Compared to other primates, including large examples such as the gorilla, the human penis is thickest, both in absolute terms and relative to the rest of the body.

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One of the most weird and wonderful products of evolution is the penis bone, or baculum. The baculum is an extra-skeletal bone, which means it is not attached to the rest of the skeleton but instead floats daintily at the end of the penis. Depending on the animal, bacula range in size from under a millimetre to nearly a metre long, and in shape, varying from needle-like spines to fork like prongs.

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Penisthe copulatory organ of the male of higher vertebrates that in mammals usually also provides the channel by which urine leaves the body. The corresponding structure in lower invertebrates is often called the cirrus. The human penis is anatomically divided into two continuous areas—the body, or external portion, and the root. The root of the penis begins directly below the bulbourethral glands with a long cylindrical body of tissue known as the corpus spongiosum or corpus cavernosum urethrae.

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Although many of us men are relatively familiar with our penis and its antics, there's more to our appendage than meets the eye. In this feature, we discuss 10 interesting things that you probably didn't know about your genitals. Whatever you happen to call it — todger, wang, willy, or dangler — the penis is an odd-looking bit of kit.

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Memorialized in monuments, Grecian statues and bathroom graffiti everywhere, the penis may be the most famous and well-studied human organ on the planet. But despite its outsized profile in the popular imagination, the male member still has a few secrets left to reveal. From penis spines to the ideal size and even penis shame, here are eight wild facts about the male sex organ.

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