"What's the plural of penis?"
The plural of penis is penises or penes.
Definition of penis:
The male genital organ.
Penises or Peni?
Being a word of Latin origin, the plural of penis is often thought to be peni. The actual Latin pluralization of the word penis is however penes.
The plural form of penis actually has two plurals as it can also be pluralized in the regular English way by adding the suffix -es to the end of the word to form the word penises.
Although both words are acceptable in English, the word penises is much more common in usage than its lesser known penes alternative.
Plural of Penis Example Sentences
Singular Example: Despite the fact that a penis contains no bone, it can still be fractured.
Plural Example: Penises are thought to become erect 3-5 times per night during REM sleep, according to researchers.
Penises vs. penes vs. peni
The graph shows the occurances of the plural of penis in written English since 1800 using Google's Ngram Viewer.
Fun Fact:
There is a popular misconception that the length of the penis organ is related to shoe size. Studies have shown no such correlation however!
Sources:
https://www.merriam-webster.com/dictionary/penis
https://www.medicalnewstoday.com/articles/320748#3.-The-shoe-size-myth
