The text quoted above which predates 1799 is remarkably close to the burlesque sung by Mr Needham prior to 1790.

I read the ridiculous nose-mouth episode as an attempt to avoid mentioning the word 'breast' in the earlier version.

Giles Collins was laid in the East Church Yard,
Lady Annis was laid in the West en,
There sprung a Lilly from Giles Collins,
Which touch'd Lady Annis's breast en
Oh, which touch'd Lady Annis's breast en.