@wgiwf That can be a confusing point, which I didn’t realize until recently was throwing myself and others off. Marriage is always a covenant between the man and the woman; polygamy can strike the observer as a kind of group marriage and so clearly wrong. However, the sister-wives, while enjoying a special relationship, are not married to one another. Fundamentally, polygyny isn’t different than a single marriage, just the same thing repeated over. The clearest descriptions are therefore plural marriage (because more of the same), or even more precisely, concurrent marriages—though that doesn’t have the euharmonic quality of plural marriage.
On that second point, it might be nice were it that way, but Akshually, see I Corinthians 6:15-17. “Shall I take the members of Christ and unite them to a prostitute?” I would not utter the words, which makes it sound like some kind of gross, and blasphemous MMF threesome, but that is how St. Paul describes the significance of seeing a prostitute. Point being, the words of the Lord in Genesis and Christ in the Gospel are significant and poetic, but should not be taken over-literally, in order to contravene polygyny, which the body was clearly designed for, and was practiced and accepted by our forefathers for as long as metalworking and musical instruments have been around.