Also symbol of medicine. Snakes have senses unlike any other animal, heat sensing glands and tongues that 'taste' the air. 3-lobed brain typical to reptiles too, highly developed parietal lobe that enables lizards to change color adapting to environment. Also regulates metabolism being a cold-blooded animal sensitive to environment temps. And said to be the seat of a third eye.
Meanwhile common among schools of mysticism is division along 2 paths being either the 'way of the snake' or the path of the dove. The snake being the more operative whereas the dove being more meditative. A question of either allowing one's thoughts and meditations to ascend through the planes (dove) or align and set thoughts into motion at levels below.
Astral plane is essentially what the Oroborous defines you understand. At metaphysical level where, say a butterfly flapping its wings at Jakarta influences the weather at New York.
I would caution any sincere occultist against spending too much time pursuing the way of the snake as symbolized in the Oroborous. The Astral is actually the lowest of higher metaphysical levels and you dont want to get stuck there. Wiccans and earth-based faiths, manipulating elements and elementals, generally dwell on the astral plane and below. What you want is closer access to the causal several levels above.
Meanwhile what you're saying about sexuality actually refers to the kundalini lower chakra of the groin, just the beginning root/source for chakra development at higher levels - spleen, solar plexis, heart, throat, forehead and crown. Can be understood as a serpent coiled thus:
Otherwise yes there's alot of mumbo-jumbo going around about earth-based faiths going full tilt boogie these days. I have lived with wiccans, admire their ways, yet can only say their God/Goddess system of belief is limitted to the material plane, ultimately subject to the causal far above that knows no such limitations and functions at levels of metaphysics far beyond the realm of binary existance. For antient Greeks access to the superior causal level was symbolized in the hermaphrodite or oracle. Thus the spiraling or coiled serpent as opposed the snake biting it's tail is a question of cause and effect or unlimitted linear capabilities much like a strand of DNA or the kabbalisic tree of life that does NOT revert upon itself like a moebus strip yet reaches forever onward.
Skip the Oroborous, says me, consider the Caduceus or Uraeus instead. Otherwise y'all can ask yourselves: Is this the *only* world you will ever know?
(:=