Phil, its called metaphor, not definition. Writing, “the orange sun”, does not make citrus of a star.
Every one of the Patriarch’s wives were female. The principle of marriage in the Bible was, as it has always been, based on begotting. Since we are on the subjects of the Patriarchs, only Israel (Jacob) had more then one wife. He was tricked into marrying his first wife Leah. If you look at the prophets, judges and other major Biblical figures then you will find that only the Israelite kings had more then one wife. Are you trying to use one specific Biblical example, with its own mitigating circumstances, to negate a societal norm?
A marriage creates a relationship we call husband and wife. Look up husbandry. What is a midwife? Notice that all these relationships have their root in child making and child rearing.
