Hi Paul,
I'm well aware of the symbolism used in folk song but most of it is commonplace and quite overt and not hidden. It's not a secret language. There are thousands of metaphor's used in folk song but the vast majority are obvious. Nothing wrong with theorising. I put in my sexual twists just to show an alternative equally valid interpretation, but all theory, and nothing wrong with that until someone says, without any evidence, 'this means so and so, fact!'

Cheers,
Steve