Usage History of 'penis'

The following chart shows how frequently 'penis' appeared in printed materials over time. For example, the word 'penis' occurred 4 times in books in 1651 and 150,404 times in 2008. From 1651 to 2008, the word 'penis' was used a total of 4,483,005 times in books scanned by Google. See Reference: Google Ngram project.

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