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A survey by sexologists showed that many men who believed that their penis was of inadequate size had average-sized penises. In humans, the AR gene located on the X chromosome at Xq which may determine the penis size. Measurements vary, with studies that rely on self-measurement reporting a significantly higher average than those with a health professional measuring. In fact, the penis of the common chimpanzee is no shorter than in humans, averaging While results vary slightly across reputable studies, the consensus is that the mean human penis, when erect, is in the range Scientific studies have been performed on the erect length of the adult penis.

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Human penis size

In humans, the AR gene located on the X chromosome at Xq which may determine the penis size. There are certain genes, like homeobox Hox a and d genes, which may have a role in regulating penis size. One study, Siminoski and Bain , found a weak correlation between the size of the stretched penis and foot size and height; however, it was too weak to be used as a practical estimator. Human penises vary in size on a number of measures, including length and circumference when flaccid and erect. Cardiovascular system peripheral Artery Vein Lymphatic vessel Heart. New England Journal of Medicine. London, England: Thames and Hudson.

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