Thank you @XChrome - you're right i have been pas ag but only after a lot of personal attacks. I'm sorry to have stooped to it. I didn't mean to say that monogamous marriages are less rich than others in general, I was having a pop at that particular poster which I shouldn't have done.
Fwiw I agree that an important depth to relationships is faithfulness, exclusivity, sacrifice, completeness. Having everything with that one person and not wanting to ever defile it with others. It's a lovely way to live and leads to incredible depth and sensitivity of a bons. It creates behaviours of kindness and loyalty.
Monogamy, done well, where you dive deeply into that, is a valuable and beautiful thing and one of humanity's greatest and most wonderful achievements.
As I've said all along, examining your life and your attachments is the important thing. Because it leads to kindness and a greater evolution of your relationships.
Whether you come out of that work monogamous or not, examining your life is better than living unthinkingly. It's bad to do monogamy badly - "kneejerk scared posessive fidelity". It's bad to do poly badly - "narcissistic shallow attention-seeking looking constantly for new supply".
However, some on this thread are comparing what they imagine to be the best of monogamy with what they imagine as the worst of polygamy and that doesn't seem fair.
This made the tone of the thread dismissive and dehumanising with some disgust for people who sleep with more than one person, and it got to me - sorry all.
OP asks whether this (ENM) is a legit way to live. I'm just here to say hi, yes it is.