Just my $.02.
Polyamory is about multiple love relationships, or if not full on "being in love," definite fondness.
Swinging seems to be about sex parties, or at the very least, 2 couple wife swapping. Mainstream swinging is about male/female sex. Or FF. MM sex seems to be frowned upon. Devloping feelings of love seems to throw a monkey wrench into the works.
Poly people usually have sex one on one. Whether a MF couple, MM, FF, or transpeople. Occasionally a poly couple will become a triad, and there can be 3way sex. Or not.
Love withers under constraint; its very essence is liberty. It is compatible neither with envy, jealousy or fear. It is there most pure, perfect and unlimited when its votaries live in confidence, equality and unreserve. -- Shelley
Mags, F, 60, poly-dating, loving and living with
miss pixi, F, 38
Punk, 42, M (dating since Oct 2015)
and a few more casual relationships