I can appreciate your opinion. I agree with most of what you said as it concerns societal norms. But while we have more in common than separates us, we aren't all the same. I don't consider monogamy a lie as you say, but a choice. As a socially imposed construct, yes, it's ridiculous. But not everyone wants to screw everything that walks. They've done research on primates and there are some species that once their partner/mate dies or is lost, they stay alone the rest of their days. There are some that have harems where the dominant male claims whatever mate he wants, and even a few where they are mostly polyamorous as you state. And everything in between. Like most things in life, if you strictly do what you are told, then you will remain as a child. Personally, I've been monogamous and had several partners, the only stipulation was honesty. I believe that is the way. Do what feels right to you. Just don't lie about it for your own self-interest at the expense of another's well being. Simple as that.