An attempted humorous pluralization of the word "penis". As with other
words from
Latin that end with "is", such as "crisis" and "neurosis", "penis" changes the "is" to "es", forming "penes", as "crisis" changes to "crises" and "neurosis" to "neuroses". Only urologists and a handful of other professionals use the word "penes", however, so it is best to stick to the
English plural, "pensises".