Sure, the slippery slope argument. I've seen used it countless times to greater and lesser effect. Mostly I find it to be intellectually lazy. Here, you are using it to suggest that we can't let two men get married now because a woman might be able to marry her dog later. Rather than spend any pixels analyzing your choice of that specific juxtaposition, let me just say that it's an argument from consequences, and not a particularly compelling one at that.
Moreover, you still forgot to specify how the marriage of half a dozen people to each other makes a run-of-the-mill hetero marriage somehow worth less.
Mostly I find it to be intellectually lazy
LOL
of course you do as you still cannot answer it
it was simple
every argument used for homos to marry can be used for any other kind of marraige.
do you see that
yes or no