Monogamy was around way before Christianity ever was. If people can enjoy themselves in polyamorous relationships, then that's great, but personally I think it would be too hard for most people to hold it together. Plus I would argue that monogramy is "programmed" into most of us, though certainly not all of us. You do hear about people in the old days having multiple wives, but those were mostly kings and other leaders showing off their power...love wasn't the prevailing factor.

People get so bent out of shape having one partner, for crying out loud. Perhaps some think that adding another person into the mix will solve the problems they're having in relationship #1, which seems to be a sure recipe for disaster.

I'm all for everyone doing whatever makes them happy. But when it comes down to having a lifelong, committed relationship, when one decides to do that, I think monogamy is generally the way to go.