The average size of an erect penis is only 5in (12.8cm), according to a 1995 survey, which is significantly smaller than most men believe.
An Italian study in 2002 discovered that, of 67 men seeking enlargement operations, all had penises well within the normal size range.
The most common causes of injury to the penis are ritual circumcision, animal attacks, bicycle accidents and zipper injuries.
The world's only museum of penises is the Phallological Museum in Iceland.
At the beginning of 2004, there were 208 penises of 84 different species of Icelandic mammals in the collection.
No human penis is yet on view, although four have been promised on the death of their present owners.
The Internet address of the Museum is www.phallus.is. Unfortunately, the even more appropriate address of www.pen.is is used by a Reykjavik erotica shop.
The human and the hyena are the only carnivorous mammals that do not have a penis bone.
According to research at the Naval and Veterans Hospital in Athens, the only part of the body of men under-40 which correlates significantly with penis length is the length of the index finger.
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