The correct plural of penis which almost no-one knows about. Simple latin is beyond the average American.
"As they removed their pants, i got the feeling i was in a great redwood forest of penes, waving all around me."
The correct usage for the plural of penis. However, it should not be a real word; because there should never be a sentence involving more than one penis.
Drunk slut: Oh, I sucked so many penes last night
Random guy: That shouldn't even be a word.