I guess maybe it is possible for people to be born Poly or not. Maybe it is not in their DNA but yet maybe it is in their Astrology. I am not “swearing by this” just passing on the research for those who may or may not agree or disagree.
Poly, meaning more then one; may be able to be found in ones chart. What I do know is that Aquarius is the “more then one” sign of the zodiac. All Air signs are the social signs of the zodiac, Gemini being maybe the most social of the three; so any of them could be Poly. My Ex (2012) and I both had a lot of Aquarius influences in our charts, so that is maybe why we were Poly?