@DaveyDrama
Makes sense. I don't think he's saying "everyone" needs to be non-monogamous, more that those who venture in to a long-term relationship or marriage with a naive view of these things are in for potential trouble.

People who talk about it, recognize the potential threats to a relationship, and come to agreements that work for both parties, are more likely to move forward. And "agreement" could be anywhere from "looking at porn or thinking about another woman = CHEATING!" to "you can only have sex with someone else when I'm in the room" to ???

Ultimately, it's futile to try to extrapolate what works for one couple to the entire world. I think one reason why monogamy is such a strong force is that it "mostly works", for "most people", "most of the time". I don't foresee a day where there's a set of relationship rules that works perfectly, for all people, all of the time.