I think there are some polygamists in the unitarian group, maybe sort of fringe even there. Not completely accepted.
One thing I am pretty sure of is that what ever the law says about gays , cultural upheaval over it might wax and wane but it will always be there swinging on a pendulum. It’s in our human DNA to struggle with the situation. Power/ security issues of all kinds , individual and group tensions , are genetically attached for all parties involved. Mother nature doesn’t have it all worked out and it is impossible that we will ever.
In 100 years the Democrats will probably be pushing homosexuality down.