I don't think people will learn to not feel jealous/upset about it anytime soon.
I agree, it's not something our society has been properly primed for and most would not be able to justify within themselves because they have too many preconceived notions about it.
Since we're talking animal instincts, it's kinda ingrained into us as
animal to compete and try to win over partners, and well, keep them to
ourselves. I'm too possessive to imagine sharing someone I'm seriously
involved with with someone else, and I'm pretty sure I'm not the only
one. I mean, if I see my gf holding hands with another dude,
talking/laughing/kissing not to mention some other stuff, it doesn't
help too much to rationally tell myself, hey, other people have fucked
her too, no biggie. Share your toys. I'd probably get there and chase
that guy away in an unpleasant way, it's what seems natural to me. It's
not because society told me monogamy is good, it's something much deeper
that gets stirred. So I'm not sure that your idea of polygamy is that natural either...
I certainly understand what you mean and yes it is quite natural for males of most species of mammal to be territorial of their mates. Jealousy exists for evolutionary reasons. The jealous passed on their genes because fought for what they have. But we as a species have evolved past that point. Especially considering the fact that sex now is far more often about pleasure and fun than reproduction and even beyond that. Polygamy has existed for a VERY long time, it isn't a modern concept by any means.
Truth is it's not that easy for most people to keep physical needs and emotional needs completely separate.
This is very true, especially considering how intensively "socially acceptable" concepts of love and sex are enforced by society and the media.
I read somewhere that brain chemicals get secreted during sex that
brings people closer together emotionally, it's a trick of nature, so if
you're willing to share someone physically you must also be willing to
share his/her affection.
True, and I believe that goes with the territory. But we share our emotions with our family and that's not a bad thing. Why would it be wrong to share your emotions with others?
And if you care about someone the way you very eloquently described you
don't want to risk losing them altogether, or get your time with them
shortened in favor of other people and all that... At least I wouldn't.
And that is where the balance comes in. This idea takes alot of communication and openness that most people aren't ready for. It takes alot of ugly honesty and truth to do it and it takes time from the ones you love and that love you when you share yourself with someone else. But again I don't think it's natural for us to pour all of ourselves into just one person and think that's enough. We are a social species and one of our basic human needs is the concept of variety.
http://training.tonyrobbins.com/the-6-human-needs-why-we-do-what-we-do/
It's very hard to stabilize variety and another very important need: Certainty. And that's what we cling to in relationships, that's why we form them, so we will have this person that is there for us and we trust them to be so.
But the best answer isn't to sacrifice one for the other. we crave the stimulation of others just as much as we crave stability. But we've settled for this system because it's the one our society told us is right.
But again, if you look at marriage statistics, and the general decline in marriage all together... You can see that those concepts are not working for us as we become more liberal, accepting, and honest about what we really want.
Again, this is all my opinion and I understand where people come from with the concept of monogamy. I wouldn't be so bold as to ever say monogamy will ever go away. I simply believe the concept of open relationships are going to become much more prevelent and acceptable as time goes on.