I think the connection is that both geeks and poly folks like to way overthink things and choose the more complicated options -- rolling up D&D characters instead of just watching sports, juggling multiple relationships instead of just practicing serial monogamy.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.