For example, men with not only a wife but 1 or more concubines as well?
A US first? Massachusetts city votes to recognize polyamorous relationships in domestic partnership policy
https://www.usatoday.com/story/news/nation/2020/07/02/polyamory-massachusetts-city-somerville-relationships-us/5370718002/
There you go! you see you didn’t have to wait long!