If you remember the name of that book, I would love to read it!
As mentioned, the above enumerated points are ‘first thoughts’...i want to ponder further to see if any of them contradict each other.
Re: the book. I can’t remember!! Somehow I feel like it is probably one by Leonard Shlain. I found his book Alphabet and the Goddess enthralling at one point and then binged on everything he wrote.
From his wiki page: https://en.m.wikipedia.org/wiki/Leonard_Shlain
[..]His books include Art & Physics: Parallel Visions in Space, Time, and Light (1991),[3] The Alphabet Versus the Goddess: The Conflict Between Word and Image (1998),[4] and Sex, Time and Power: How Women's Sexuality Shaped Human Evolution (2003).[5][..]
I want to say it’s one of his for sure. It was beautifully written and I loved the words as much as the content. So I want to say that I am 90% sure it’s one of Shlain’s books!
I think religious morality and wealth inequality greatly affects the hypothesis in both the books you mentioned.
No doubt, there will be a small percentage of world population that will play out that hypothesis but majority will not.
The chances that the human species will adopt poly lifestyle is small to nil, imo.
However, I think marriage as well as polyamorous or just about any relationship should come with reevaluations and time limit. It is a human universal to want to have an ownership stake in any relationship. It’s higher during reproductive age(due to the cost of rearing young).
If the concept of marriage(because it does carry a respectable heft of societal approval and reflects religious morality) is abolished AND if women are truly independent..especially financially, then I think it would become more prevalent and acceptable.
In one of my imaginary worlds, communal child rearing will also likely allow people to embrace free love, as it were...I believe that love has the propensity to include many people and at the same time, but only if external pressures that cause relationship insecurities and vulnerabilities are alleviated.
I am trying to remember the book where I read the different kinds of love...courtly love, romantic love etc etc. it was fascinating because ‘love’ through the various centuries was entirely a function of religion and society and economics. But love is what happens between our eye brows and inside our skulls powdered by brain chemicals. We are resistant to accept it.
I find myself happy to accept love when I recognize it, hold it in the now and then release it. On the flip side, I realize that I have enormous capacity to hate. It surprised me but I don’t deny it either. I dislike as many people as I love. It’s like curses and hexes kind of hate. I guess it is my unintegrated shadow inching towards my self.