So, might I ask, then: What is your position with regards to gays marrying? Not the "lifestyle" or the people (or their general attitude), but the civil union.
For / don't care / against?
Honestly, I say why the heck not. To those who claim the idea erodes the family, I say I'm not terribly impressed with their family if they think it so fragile.
As for having multiple spouses, again, why not? I wouldn't want that kind of trouble, but why should I stop somebody else? I'm reminded of a fellow I knew years back who said, "Anyone might as well be able to marry anyone - why should I be the only one to suffer?"