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Another study (from 1998) of 150 Koreans found the average erect penis length to be 13.42 cm (5.28 in). [17] In a different study conducted in 1998 with 287 Korean men, the average erect penis length was found to be 14.06 cm (5.54 in). [18] A 2016 study of 248 Korean men identified the average erect penis length to be 13.53 cm (5.33 in). [19]
An erect penis may be straight or curved and may point at an upward angle, a downward angle, or straight ahead. As of 2015, the average erect human penis is 13.12 cm (5.17 in) long and has a circumference of 11.66 cm (4.59 in). [2] [3] Neither age nor size of the
A new study done by a team at Stanford Medicine found that the average penis length has increased 24 percent over the past 30 years. Find out more here.
Generally, the size of an erect penis is fixed throughout post-pubescent life. Its size may be increased by surgery. [19] Though the size of a penis varies considerably between males, the average length of an erect human penis is 13.12 cm (5.17 inches), while the average circumference of an erect human penis is 11.66 cm (4.59 inches). [20]
Please change "A study of 115 men from Nigeria found that the average flaccid stretched penis length of Nigerian males is 13.37 cm (5.26 inches) long, which is near identical to the worldwide average, stretched flaccid penis length of 13.24 cm (5.21 inches) and average erect penis length of 13.12 cm (5.17 inches)."
Among bird species with a penis are paleognaths (tinamous and ratites) [11] and Anatidae (ducks, geese and swans). [12] The magpie goose in the family Anseranatidae also has a penis. A bird penis is different in structure from mammal penises, being an erectile expansion of the cloacal wall (in ducks) and being erected by lymph, not blood. [13]
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A study by Swan et al. determined that the AGD is linked to fertility in males, and penis size. [3] Males with a short AGD (lower than the median around 52 mm (2 in)) have seven times the chance of being sub-fertile as those with a longer AGD. It is linked to both semen volume and sperm count. [8]