I guess I'm more getting at the term itself than the concept. People for a while have sometimes said 'we have an open relationship' which to my mind is functionally the same thing. The other nearest option would be non-partnered in which case a title isn't needed anyhow.

The part that seems weird to me is by specifically labeling it as ethical, it implies that the standard non-monogomy is unethical which seems like a strange stance to tie a lifestyle to if usable terms exist.

Just the philosophical musings of a fairly vanilla middle age dude navigating the modern social world though. 🙂