Earlier quoted context omitted.
Monogamous marriage between a man and a woman is historically far and away most common social structure around the world, although obviously there is a vast amount of variety.
I'm doubtful of that. Homosexuality was very normalized in the ancient western world, but it looked very different then modern conceptions. How many people do you know recently that used marriage to secure an economic/political alliance? Pretty common among elites historically, almost unheard of today.
Indeed... most of what modern day LGBTQ+ activists conceive of as homosexuality in the ancient world is just close male friendship.
Half the things people claim were instances of 'homosexuality' in ancient literature are just men fooling around. There are very few instances of men (or women) actually forming stable social structures with commitment in the absence of marriage to the opposite sex.
Ultimately, our confusion in this regard is due to the fact that so few men have actual friends. I sometimes go out 1-on-1 with my male friends to restaurants (often fancy ones). It's a guys night. We're all married with kids. And yet, oftentimes, people will think we're dating or something. It's weird. FFS, I went with my father to a nice restaurant, and they thought we were married. Something has gone very wrong with how we conceive of men being friends, which makes sense, because so few men have any (which probably explains the rise of homosexuality as well).