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Old 08-29-2010, 12:41 AM   #4
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Join Date: Oct 2001
Location: Chaoyang, Beijing, China
Posts: 826

Contrary to what you may have heard in prison, the pluralization of cocks is hardly trivial.

Penis is a third-declension Latin noun, not second. Only second ones do the us->i shift. Since you don't write "penus", it can't follow these rules.

Pen[is] has a -is ending as a singular noun. As a third-declension noun, this means its plural is penes, which is the spelling you will see in some medical literature.
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