Why Are So Many People Okay With More Than One Kid, But Only One Spouse?

jorfan3
What is it about marital relationships that makes people only want to have one? Polyamory and polygamy are the minority. Why do we consider having 2-3 kids acceptable, but more than one husband or wife challenging or unacceptable?

I'm not into polyamory or polygamy necessarily. I'm just curious what people think about why these relationships are considered different. Is it because of sex?
Why Are So Many People Okay With More Than One Kid, But Only One Spouse?
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