[quote="ClemtheCatholic, post:7, topic:339353"]
Just so we're clear, all I'm trying to do is make sure I know the Church's case and then be able to argue it well. :)
So are we saying that, for example, King David's partnerships with multiple women were not marriages?
Not as God would have it, no. Kings at the time would marry daughters of other kings to cement alliances. They also had concubines. Most Jewish men didn't follow this practice. If they took a second wife it was generally because they wanted more children/sons, if the first had not had enough/any sons. Keeping more than one wife came with financial and relationship costs, so a man had to have the resources to support a larger family. In our times, when women expect a man to give her his full attention, due to the elevation of women's status brought about by Christianity, this arrangement generally doesn't work all that well.
As for same sex marriage, the comparison is simply not there. Merely because God allowed men to have more than one wife due to the weakness of human nature doesn't translate into allowing that which is not even possible through nature. Marriage is more than love and affection--it's creating families open to producing new life. It's for the benefit of children, not just so adults can satisfy their sexual urges. SSM cannot fulfill this except through adoption. Frankly, submitting children to this social experiment is unfair to them and to our future society. It will never be right and natural no matter how many laws men may pass.