Yoif.
I tend to react to someone arguing that polyamory is “more emotionally evolved” much the same way as I’d react to someone saying being gay is “more emotionally evolved”. And the monogamy-superiority folks strike me as about as clued as “heterosexuality is the real natural way” nitwits. It’s just another point of orientation or choice-space. No big moral whoop. Some people are straight, some people are gay, some people are bi; some people are monogamous, some people are polyamorous or polysexual, and some people are switch. Populations have wide variety.
Me, my husband and I have been together for eight years, and open for the whole time. (We figured that when we were going to be long-distance from each other for college, it would be stupid to require monogamy; besides, if we met someone that made us want to leave the other, we’d rather know now than later. We both met people. None of them threatened our relationship in any way.) My other primary and his wife have been together for eight years, and open for the last two and a half.
I have secondary relationships; none of them are the sort of relationships that could be a marriage in the first place, but since I’m not trying to force them into that role or drop them as failures, they persist. My husband doesn’t have heirarchy work in his head, so he just has relationships, not primary, not secondary. Not sure about my other primary; he dithers on this. His wife is polyfidelitous – only has relationships that are marriage-equivalent.
I firmly believe that “to be faithful” means “to keep faith”, to not break one’s promises, and someone who presumes that those promises necessarily include sexual or emotional exclusivity is missing out on the idea that people should pick what commitments they make and make the ones that matter to them, that they can uphold.
(Anyone watch soaps? I did when I was a kid. All these people making promises they knew they couldn’t uphold, because other people figured that those were the promises they had to make to be valid. Of course, if they stuck to the promises they could keep faith on, there wouldn’t be so much sturm und drang to make for drrrrrrrrama.)
To a person who was asking about children in such relationships, I know of one extended poly network that has polyfolk for two generations at this point; I don’t know if it was the poly daughter or the monogamous daughter who recently had a kid, but I think it’s a bit early to evaluate the sexual orientation of the infant in question. There’s also a four-person family with children that has a website at http://ourlittlequad.com/. My family has yet to produce children.