Monogamy: It's Bad for Love
Monogamous marriage models largely stem from agriculturalization and the need to have sons to inherit land and dowry to obtain wives as a transaction of property to give the man more sons. Because traditionally, land could only be passed down to male heirs, women were viewed as chattel -- basically objects to be bought and sold like property -- which is why in ancient religions like Judaism and Islam, women were essentially married off to men either in arranged marriages or through dowries. China also has a long practice of dowries and equating women to property or at least tying up her worth in the ability to be an incubator to produce male heirs to inherit the land of their fathers. Daughters were traditionally sold off to other families. It's also why, I think you'll find, many world religions emphasize that it should be a man and a woman, or a man and multiple women, who should be allowed to marry and not, for example, homosexuals. Homosexuality doesn't produce offsprin