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Hm...
Well at first I couldn't see a reason why several consenting adults couldn't marry. But what happens if two of them have a child?
Not that they couldn't create a healthy environment in which to raise a child.
But I just see there being a lot of problems for that kid down the road.
For example, what happens when he gets to school and the other kids make fun of him or avoid him?
The parents willingly made the choice to have multiple partners even though society won't accept that (at least for a very long time), but the child didn't.

Though I guess the same thing could be argued for gay couples raising kids.
And I obviously don't have a problem with that.

Still, I think it works in some cultures, but I don't see it ever being widely accepted in America.
At least not for a very long time.

yeah
if we lived in a culture where polygamy was norm, we might be having this discussion about marriage between 2 people

Pretty much.

Hmm... It's a tough thing. I guess I don't have any right to tell anyone to stop doing something like that, as long as there's a "contract" between all people in such relationship, if they all agree. All at once, and everyone loves everyone, with no exceptions. But personally I wouldn't like something like this in my own life... I'm just to possesive xd or I just am a stupid romantic girl who believes in "true love" between two... I don't know, but I see examples around me, so I guess it's not a fairy tale.
Still there's a question about love itself. I like the idea of free love, but only if I define it as an act of total affirmation of another person. I'm actually trying to follow this, but sometimes it's hard. But not impossible.
heart

Lol! I did expect a pretty liberal attitude from you guys, and I wasn't disappointed. Let me give definitions of terms, via Wikipedia:

Polygamy can be defined as any "form of marriage in which a person [has] more than one spouse."

Polygyny (from neo-Greek: πολύ poly - "many", and γυνή gyny - "woman or wife") is a form of marriage in which a man has two or more wives at the same time."

Polyandry (Greek: poly- many, andros- man) refers to a form of sexual union, in which a woman is married to two or more husbands at the same time.

Polyamory (from Greek πολυ [poly, meaning many or several] and Latin amor [love]) is the practice, desire, or acceptance of having more than one intimate relationship at a time with the consent of everyone involved.

Group marriage is a form of polyamory in which more than one man and more than one woman form a family unit, with all the members of the group marriage being considered to be married to all the other members of the group marriage, and all members of the marriage share parental responsibility for any children arising from the marriage.[1]

So... Yeah. I actually didn't know some of that. sweatdrop

And I think polyamory is still controversial just because even though there may be love triangles, the people involved are still eventually forced to "choose" and if they don't settle down with just one, I think people tend to look at that as only having to do with lust, rather than love.