jools:
As far as describing female anatomy is concerned it has often been said that Coleridge's poem Kubla Khan is also a metaphor for the female genitalia and the sexual act itself.
I've often wondered whether Kubla Khan is a work of genius or the unexpected result of narcotic influence?
Coleridge himself made a distinction between the times he was high and the times he was lucid, calling the first the "ego nocturnos" (the night-self), and the second the "ego diurnus" (the day-self).
Having studied the Rime of the Ancient Mariner for my 'O level' years ago, I can confirm that there were times when the "ego diurnus" definitely took over.