I'm familiar with the idea, but I think it's irrelevant. We're very, very removed from a lot of so-called "natural" instincts, and we have the ability to reason and follow established values and rules.Nope. That's something I've believed for a long time. And if you google it, you'll see that plenty of biologists do too.
98% of mammals are polygamous. Early human societies were polygamous.
Ever asked yourself "why would fill in the blank cheat on her with her?" Because they're not just looking for an upgrade. They're drawn by natural instincts.
That we can make the case for non-monogamy is a cop-out when we've consciously chosen monogamy. People don't cheat b/c of nature; they cheat b/c of some other failing.