Slippery Slope 1
Oliver Willis and I have come to the same conclusion on polygamy–provided it’s among consenting adults.
And no, I don’t think that’s the next step on the “slippery slope” that people are worried about if gay marriage becomes legal. I’m fine with consenting adults (both of which are operative words here) being able to pretty much do what they want within the privacy of their own homes, provided it doesn’t hurt anybody. And if my gay friends (or my gay roommate) wants to marry someone of his own persuasion, why not? Likewise, if people in “open marriages” or whatever are all cool with sharing, why not?
In related news, Rosie O’Donnell actually made a coherent point on the subject: spousal privilege is not a part of civil unions. Therefore, to ensure equal legal rights, gay marriage is necessary.