What, they love each other that much yet can't stand to be together
I'm a joined at the hip kinda girl and I don't mean that they can't stand to be together. I mean if they have incompatible personalities. Some people are the kind that thrive on being alone a lot, maybe even on long wilderness hikes for weeks at a time and that could drive a more needy spouse crazy, if they need someone to sit on the couch with them every night before leading them by the hand to bed.
Generally people work big details out before becoming intimate, but when they find this problem arising they have several choices, live with crazy feelings, divorce or accommodate. I say accommodate, rather than turning to divorce.
without having sexual relations with other people to 'let off some steam'?
There's this monogamous couple I know of that are really in love. He spends most of his life overseas at work. She's alone for years at a time. I think it's hardest on her. Many women leave for less heartache. If they had another spouse it might be easier for her, and in turn, for him. Possibly, anyway. They have kids, too. Really in love and together - yet apart.
If your husband was out having intimacy with another "wife" while you were sat home doing the laundry or something, then you really would be happy with it?
Sure. What would it matter to me if he did that or went bowling with guy friends as long as I knew he was not getting into trouble?
Also, what about these additional 'wives'? Aren't they just effectively 'add ons' so what exactly do they get out of these 'arrangements' if it's for the benefit of your marriage?
Actually, I can think of a long list they would get. 7 instant sons/daughters, a proven husband who is never abusive in any sense of the word, a wife-best-friend, a man who is proven fertile who makes beautiful, friendly, well raised children, an end to being alone or fearing a lonely old age, etc. Not to mention free child-care, free house-help, extra resources, etc.
One big reason a wife like me would think about polygamy is for the lonely women who can't get a good man. My man is so good he gives me survivor guilt. I took him out, so to speak. With monogamy, nobody else can know the joy - no one else can have my one-in-a-million perfect husband...
If you check the link your husband used as 'evidence' to support polygamy it emanates from a dominant male perspective in a patriarchal environment. You might be happy enough with that but most women wouldn't be, certainly not nowadays and for a good while now. Polygamy is very much centred for men, not women.
You assume too much. Just because it's usually the cassa-novas getting the girls, it doesn't mean they are jerks. They get the girls because they are too good to pass up in every way. Every way. And the wife can "tell-all" before they ever say I-do, so only the reputable guys would be that magnetic and influential. Unless you imagine female hostages for life. I don't. Those kind of men would have loyalty issues and would soon be ousted/killed/abandoned, greatly limiting their seed-spread.
There are other routes around infertility without having a myriad spouses so that's a misnoma.
There are end-routes involving another man's sperm when the husband is infertile. That leaves a birth-father without a connection to his children. How nice is that to the children? Why not take the provider/father with the seed and include him?
Do you not think that in general, most couples have already talked about having or not having children before getting married?
I'm married with 7 children and many married friends. People can get cold feet about having more and likewise can suddenly get "the baby bug." That's a dynamic situation.
Your solution to any problem in a marriage seems to be to get another spouse
That's a needlessly inflammatory assertion. I have suggested no such thing. But polygamy is better than divorce and makes more sense, absent any kind of abuse in the relationship.
and you seem blind as to just how destructive that could be in itself.
You should opine about that further if you really think it holds water.
There's a reason why most people make a commitment to the one person if they embark on wedlock, even if things go awry later on. Can you appreciate that much?
Social constructs. I can appreciate the concept of taboos and tradition. Social creatures have a weakness for that sort of thing.