Pete, the problem I have with the idea that "Jesus confirmed that was how it should be" is that Jesus was NOT arguing what marriage should be, he was arguing why divorce is wrong. To take an argument made in one debate and simply transfer it to a different debate as normative is, to say the least, dodgy.

It seems to me that the most important things to Jesus and the other biblical writers are fidelity and commitment. There is a lot about those, but virtually nothing about the nature of those relationships.

Personally, I am very happily married to one woman and would not want to change that, so this is not an issue to me, I am just very wary of making my own preferences into God's without a very clear mandate to do so.