Earlier quoted context omitted.
I don't say monogamy is a natural rule everybody should follow but it also is not unnatural "bullshit" invented by humans. As far as I know many wild species are monogamous. Many bird species in particular. I don't mind anybody being polyamory (and even some sort of adore them for breaking a taboo) yet many people are happy in monogamy and they are not necessarily constraining themselves artificially. Also shame can…
Monogamy is pretty much limited to birds. It's uncommon in mammals and in primates in particular. It's interesting that humans arrived at it.
Throughout our history, it's also mostly practiced out of necessity/pressure by the underclasses/commoners* of human society, not the rulers/leaders/wealthy.
* (not counting prostitution)