I can't believe that the "Balls" version is an obscene transformation of "Ears"--it's surely more likely that the secons is a scoured version of the first, which is therefore first in time [this is actually often the case, as in e.g. the Scots convivial song "Andro and his Cutty Gun", which is proved by the sense of the bawdy version and the non sequitur of the clean]. Cray finds the camp version in Frank Lynn's "Songs for Swingin' Housemothers" (1963), indicated melody "Turkey in the Straw"; but his own tune is the "correct" one of *The College Hornpipe* [often called just "The Sailor's Hornpipe], going in sol-fa d't d' d d sf ms d' d' etc. Cray's remarks, incidentally, of the relationship to old ballad tunes, is a bit unfounded, I think. I may as well give you my text:

Do your balls hang low? Can you swing them to and fro? Can you tie them in a knot? Can you tie them in a bow? Can you swing them to the ceiling With a free and easy feeling, Did you ever catch your ballocks in a rat-trap, O?