The enduring question about average penis length is difficult to settle. Now, the most comprehensive scientific study of the topic has some hard numerical answers.
The study is claimed to be the first to combine all existing data on penis length and girth — a total of 15,521 data points — into a definitive analysis. Its results show that the average penis is 5.16 inches in length and 4.6 inches around when erect, and 3.6 inches long and 3.7 inches around when flaccid.
Participants were men aged 17 to 91, who'd had their penises measured in 20 previously published studies carried out in Europe, Asia, Africa and the United States. The study claims that <2.28 per cent of the male population have an abnormally small penis and 2.28 per cent have an unusually large one. The results are published in BJU International in a paper titled 'Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15 521 men'.
The results found no evidence to suggest that penis size varies with race, but the majority of participants were European and Middle Eastern so it was hard to tell for sure. There was also no convincing relationship between foot size and penis length.
It's plausible that the results are slightly skewed. The researchers point out that volunteers who are more confident about their dimensions will have volunteered to be measured up. But, for now, this is still the best we have. [BJU International via Guardian]
Image by Håvar og Solveig under Creative Commons licence