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The Wikipedia article on penis size give much smaller averages than most: this is because it confines itself to scientific studies:
Here is the relevant part:
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There have been several studies regarding the average size of the human penis. The majority of such studies could be flawed due to self-selection bias: men with a below-average sized penis might be less likely to allow themselves to be measured, or men with a larger-than average sized penis might be more likely to allow themselves to be measured (making the figures noted below also above the true average).
Erect length
http://en.wikipedia.org/wiki/Image:Penis_frequency.jpghttp://upload.wikimedia.org/wikipedia/en/thumb/d/d0/Penis_frequency.jpg/250px-Penis_frequency.jpg http://en.wikipedia.org/wiki/Image:Penis_frequency.jpghttp://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Frequency graph of LifeStyles data
http://en.wikipedia.org/wiki/Image:Penis_percentile.jpghttp://upload.wikimedia.org/wikipedia/en/thumb/6/6e/Penis_percentile.jpg/250px-Penis_percentile.jpg http://en.wikipedia.org/wiki/Image:Penis_percentile.jpghttp://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Percentile plot of LifeStyles data
Regarding the length of the adult fully erect penis (measured along the top of the penis from the groin to the tip), several studies have been performed. Studies that have relied on self-measurement consistently reported a higher average than those that had staff take the measurements.
Erect circumference
http://en.wikipedia.org/wiki/Image:Penis_circum.jpghttp://upload.wikimedia.org/wikipedia/en/thumb/8/88/Penis_circum.jpg/250px-Penis_circum.jpg http://en.wikipedia.org/wiki/Image:Penis_circum.jpghttp://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Plot of LifeStyles data of circumference
http://en.wikipedia.org/wiki/Image:Penis_circum_percentile.jpghttp://upload.wikimedia.org/wikipedia/en/thumb/4/4e/Penis_circum_percentile.jpg/250px-Penis_circum_percentile.jpg http://en.wikipedia.org/wiki/Image:Penis_circum_percentile.jpghttp://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Percentile plot of LifeStyles data of circumference
Similarly, regarding the circumference of the adult fully erect penis (with the measurement taken from the midshaft of the penis), several studies have been performed. Just as with length, those studies that relied on self-measurement consistently reported a higher average than those that had staff take the measurements.
So maybe a lot more people are eligible to be here than you'd think.
Here is the relevant part:
---------------------------
There have been several studies regarding the average size of the human penis. The majority of such studies could be flawed due to self-selection bias: men with a below-average sized penis might be less likely to allow themselves to be measured, or men with a larger-than average sized penis might be more likely to allow themselves to be measured (making the figures noted below also above the true average).
Erect length
http://en.wikipedia.org/wiki/Image:Penis_frequency.jpghttp://upload.wikimedia.org/wikipedia/en/thumb/d/d0/Penis_frequency.jpg/250px-Penis_frequency.jpg http://en.wikipedia.org/wiki/Image:Penis_frequency.jpghttp://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Frequency graph of LifeStyles data
http://en.wikipedia.org/wiki/Image:Penis_percentile.jpghttp://upload.wikimedia.org/wikipedia/en/thumb/6/6e/Penis_percentile.jpg/250px-Penis_percentile.jpg http://en.wikipedia.org/wiki/Image:Penis_percentile.jpghttp://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Percentile plot of LifeStyles data
Regarding the length of the adult fully erect penis (measured along the top of the penis from the groin to the tip), several studies have been performed. Studies that have relied on self-measurement consistently reported a higher average than those that had staff take the measurements.
- A study published in the September 1996 Journal of Urology concluded that average erect length was 5 inches (12.9 cm). (Measured by staff).
- A UCSF study by Wessells et.al. published in 1996 found an average of 5.1 inches (13.0 cm). (Measured by researchers)
- A study by a Brazilian urologist found an average of 5.7 inches (14.5 cm). (Measured by researchers)
- A German study in 1996 also reported an average of 5.7 inches (14.5 cm). (Measured by researchers)
- A study conducted by LifeStyles Condoms during 2001 Spring Break in Cancún found an average of 5.9 inches (15.0 cm). (Measured by staff)
Erect circumference
http://en.wikipedia.org/wiki/Image:Penis_circum.jpghttp://upload.wikimedia.org/wikipedia/en/thumb/8/88/Penis_circum.jpg/250px-Penis_circum.jpg http://en.wikipedia.org/wiki/Image:Penis_circum.jpghttp://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Plot of LifeStyles data of circumference
http://en.wikipedia.org/wiki/Image:Penis_circum_percentile.jpghttp://upload.wikimedia.org/wikipedia/en/thumb/4/4e/Penis_circum_percentile.jpg/250px-Penis_circum_percentile.jpg http://en.wikipedia.org/wiki/Image:Penis_circum_percentile.jpghttp://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Percentile plot of LifeStyles data of circumference
Similarly, regarding the circumference of the adult fully erect penis (with the measurement taken from the midshaft of the penis), several studies have been performed. Just as with length, those studies that relied on self-measurement consistently reported a higher average than those that had staff take the measurements.
- An UCSF study by Wessells et.al. published in 1996 found an average of 4.9 inches (12.4 cm). (Measured by researchers)[4]
- A study by a Brazilian urologist found an average of 4.7 inches (11.9 cm). (Measured by researchers)
- A study conducted by LifeStyles Condoms during 2001 Spring Break in Cancún found an average of 5.0 inches (12.7 cm). (Measured by researchers)
So maybe a lot more people are eligible to be here than you'd think.