Oh, also, in my mind swinging implies that generally you're open to having sexual contact with relative strangers, whereas polyfuckery could occur exclusively with people you know well.
The major players. Me, under-30 bi female. Gia, girlfriend of 3+ years. Clay, new boyfriend/dom. Davis, ex/"it's complicated."
The supporting cast. Eric, Gia's husband. Bee, Gia and Eric's toddler. Dexter, Gia's lover. Helen, Eric's lover. Izzy and Nikki, Clay's partners. June and Royce, Izzy's partners.