OP, the evolution of monogamy is more complicated than "Babylon made us do it." (though there is truth in that of course)
If there was no expectation of monogamous pairing, then the mediocre men would be in a constant state of sexless agitation, and the alpha males would horde all of the women. We would be at each other's throats all the time, and tension would be palpable and universal. Instead every guy has a feeling that he is going home to get his, and we are therefore capable of cooperation and civility.
Also have you ever tried to reason with women? Now that they have downloaded the monogamous pair meme, from their cold dead minds! lol
"Ah, those endless forests, and their horror-haunted gloom! For what eternities have I wandered through them, a timid, hunted creature, starting at the least sound, frightened of my own shadow, keyed-up, ever alert and vigilant, ready on the instant to dash away in mad flight for my life. For I was the prey of all manner of fierce life that dwelt in the forest, and it was in ecstasies of fear that I fled before the hunting monsters."
Jack london, "Before Adam"