When you get into Qabalistic territory, especially Hermetic Qabalah, it can be hard to distinguish precisely between the pagan and the non-pagan. Everything fits someplace on the Tree.
I can't really picture Mac 'n Moina opting for such imagery, given the celibate nature of their own marriage. Although I may be making be a simplistic interpretation of their relationship and of the esoteric aspects of what they discovered and incorporated in the G.D.
My hunch is that it's from a post-Renaissance, pre-Victorian time, giving us a target period of a couple of hundred years when people weren't always prudish yet were also fascinated by alchemy and Hermeticism. But that's just a hunch.
For years, I assumed that, once the doors were safely closed, the old Rabbis told their senior students what the real secrets were, and these images are part of that. I could (just) have been right. There's an unquestioned current of sexual mysticism in Hebraic Qabalah, even today.