Interesting replies, and a great post to start it off
For myself, I don't see the two as being inherently linked.
That said, I also know for a fact that you can have some amazingly spiritual experiences with other people... you don't even need to be in a relationship beyond friendship or casual acquaintance. Could polyamory feed into a spiritual system, or the reverse? I don't see why not. I don't think though, as I said, that the two are necessarily bound to one another.
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