I am not so sure that this makes sense to me- if there is intense competition for individual women, why would the fitter men let everyone get in on that?
Yes I have. There's lots of competition for women, and there's lots of communal events that could easily translate to gangbangs if we were tribal or living in Ancient Greece.
I am not talking about monogamy or anything, just refuting your idea that you can somehow be born into and raised in a small clan, and not have a likelong emotional attachment to everyone around you.
Still, you're comparing modern society with it's monogamous morals and memes to ancient society with a lack thereof.
"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"