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What is the average penis size?

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Results vary across studies. Mean human penis is approximately 12.9 – 15 cm (5.1 – 5.9 in) in length with a 95% confidence interval of (10.7 cm, 19.1 cm) (4.23 in, 7.53 in). Girth or circumference is approximately 12.3 cm (4.85 in) when fully erect.

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