There was a Showtime show that you can still watch archives of that was much more about the normal lives of poly people. I’ve never watched the Sister-wives show either since that strikes me as polygamy, which tends to have a big power imbalance. The man has multiple partners but the women don’t.

Polyamory: Seasons, Episodes, Cast, Characters - Official Series Site | SHOWTIME

Another show was You Me Her about a three-way relationship.

You Me Her | An AT&T Original Series on AUDIENCE Network

Although You Me Her did the better job of the two just showing the relationship as one aspect of their lives, it’s still taboo and salacious enough that I imagine it won’t be a non-central aspect of any characters anytime soon, but you never know.