A variation of this gives the coy verse

Oh Sir Jasper, do not touch me

Oh Sir Jasper do not touch me

Oh Sir Jasper do not touch me,

As she slipped between the sheets with nothing on at all.

Tune is the chorus of 'John Brown's Body', of course; and the joke [such as it is] consists in the omission of the last word of the first 3 lines, then the two last words, and so on, till you get "Oh Sir Jasper!", "Oh Sir!" and finally "Oh!"