Seriously. There are words of Anglo-Saxon origin for all other organs and activities that used to be taboo (some still are) dating back to pre-Conquest days. But nothing for "penis". I find it hard to believe that the author of the "country matters" pun, or his commoner contemporaries, or their forefathers, would use a Latin term for something of such momentous importance (in every sense of the word). For a while I thought that the word "dick" was of old Germanic origin until I discovered that it's a slang word that first appeared in the late 19th Century.
Could someone please elucidate this for me?
Note: Euphemisms and figures of speech do not apply. No, it does not have to mean the same thing in modern English. It doesn't even have to exist in modern English.