All about the anus
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Its function is to control the expulsion of feces , unwanted semi-solid matter produced during digestion, which, depending on the type of animal, may include: Amphibians, reptiles, and birds use the same orifice known as the cloaca for excreting liquid and solid wastes, for copulation and egg -laying. Monotreme mammals also have a cloaca, which is thought to be a feature inherited from the earliest amniotes via the therapsids. Marsupials have a single orifice for excreting both solids and liquids and, in females, a separate vagina for reproduction. Female placental mammals have completely separate orifices for defecation , urination , and reproduction; males have one opening for defecation and another for both urination and reproduction , although the channels flowing to that orifice are almost completely separate. The development of the anus was an important stage in the evolution of multicellular animals.
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13 Fundamental Facts About the Anus
Human anus - Wikipedia
In psychology , the Freudian term anal fixation is used. Society and culture Main article: Anal sex The anus has a relatively high concentration of nerve endings and can be an erogenous zone , which can make anal intercourse pleasurable if performed properly. The pudendal nerve that branches to supply the external anal sphincter also branches to the dorsal nerve of the clitoris and the dorsal nerve of the penis. This is the source of the term " anal-retentive " and the derived informal term "anal". In addition to nerve endings, pleasure from anal intercourse may be aided by the close proximity between the anus and the prostate for males, and vagina , clitoral legs and anal area for females. This is because of indirect stimulation of the prostate and vagina or clitoral legs.
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The hair around your asshole muffles your farts. Having a bigger ass is actually advantageous. Standing up, walking, climbing stairs, crouching, or just standing erect. There is a bone at the top of your ass called the coccyx, which used to be a tail before evolution weeded it out. On average, people fart between thirteen and twenty-one times a day.
November 27, iStock. Each eye has more than a million optic nerve cells and over million photoreceptor cells , making it one of the most complex organs we have. Newborn babies see the world in black and white—and red.