The first humans, those who lived between 5 and 1.8 million years ago, had very little use for marriage. It is presumed that early males and females had sex with many partners. Food sharing was principally in exchange for sexual favors, including sexual favors between same-gender pairs.
Between 1.8 million and 23,000 years ago, the males and females whose offspring were the most likely to survive were those that formed the very first marriages. Couples in this period would probably have stayed together for about three or four years before one, or the other, would wander off to start another family (Perhaps not coincidentally, this is exactly the length of time (3 or 4 years) at which divorce rates peak in modern day marriages)
About 23,000 years ago, humans started to grow their own food, revolutionizing human relations. This is the era in which marriage became the union between two people that was recognized by their community. Agriculture tied people to their land, meaning that at the end of the four-year period neither men nor women had any inclination to wander off to find a new family. And so they stayed together and worked as a unit to feed and care for the children they produced.
The real origin of marriage came from the biological desire of both men and women to see their children survive – it was the evolutionarily dominate strategy... @bigthinkers
Model: @r34l_function & @ivettenelys