SolidGoldBrass yes exactly! There are loads of people for whom monogamy works brilliantly and is fulfilling and simple. There are also loads of people for whom it may not work perfectly as such, but it's the best option for all kinds of reasons.
The only thing I'd like to happen, from speaking openly about being poly (and we're out to everybody - families, co-workers, everybody - we don't bang on about it but I will occasionally drop into conversation 'oh, my husband's on a date tonight so I'm planning an Orange Is The New Black marathon while he's out' or similar) is for people to recognise that monogamy is a choice, not necessarily the only option. And for people to be able to say 'yes, this is why I value monogamy, this is why it works for me, and this is why it's such an important thing in my relationship', as well as for some people to say 'huh, okay, maybe there's a different way we could do this' (or even 'huh, we were already doing this thing, and maybe it's not as weird as we thought...').
PontyGirl the 'do you ever get jealous?' thing is an interesting question, because to answer it I want to back up a sec. I don't think jealousy in itself is necessarily a bad emotion, it's how you deal with it that matters. I think it's a 'second-level' emotion, in that there's generally something else underneath it, and if you can dig out whatever the something-else is, the jealousy is usually resolved. So yes, I do occasionally get jealous, and so do other partners, and for me on every occasion it's been down to not feeling fulfilled in myself about something - if I haven't been getting enough time with someone, for example, then I might have a little wobble about them spending time with other people doing things I'd like to do. But as long as you're able to be fairly self-examinatory (is that a word? it is now) about that sort of thing, and speak openly with your partners about fears and worries, you can usually uproot it pretty quickly. But mostly, no, it's really not something that comes up for us very often; certainly not for the last few years.
And obviously that's spoken from a very fortunate position of never having been in a relationship that's been based on deceit or malice or manipulation - lucky me - so those jealousy 'warning bells' are always easily-unpicked false alarms. In a bad relationship, obviously those emotions serve a different purpose.
beavington your second paragraph absolutely nails it. The joy of a new relationship is a really special thing - and being able to share that with someone else you love, or being able to be on the inside watching your partner fall head-over-heels for someone and sharing all their excitement and happiness and fizz with you... it's something I find just utterly utterly joyful.
I am certain it helps living in a large city though, yes. I have no idea as yet how it fits in with family life, but I know a few friends with small children who are poly, and it works for them! I'm pretty confident that (like any new mum) whatever assumptions I have about what my life will look like in a few months are about to be proved wrong
I'm sure if I had an additional stable relationship at the moment, that would likely be a huge support in the early months, but I don't and it's certainly not something I'll be seeking out for a while!
Sorry for the massive ramble - like I say, I can only speak for how it works for me but I've tried to answer questions in the hope that it's an interesting read for a few people!