Back to the issue at hand, without a moral compass--and necessarily intrinsic and dare I say religious values behind it our law is in big trouble. The gay argument applies perfectly to adult incest or even bestiality, as gross as these things are to most of us. It's slightly farther reaching regarding bigamy or polygamy but not much. Once a moral standard cannot be applied to people behind closed doors who knows what can happen.
We need to remember the pernicious application of an imagined-in-the-Constitution "right to privacy" allowed the intentional killing of 50 million+ Americans by abortion.
"If God does not exist, everything is permitted."
- the character Ivan Karamazov of Dostoyevsky's The Brothers Karamazov
On who's authority? Why are you so concerned about what people do with Mr Winky? Are you afraid that you are going to miss out? Or do you find that behavior offensive, so you are going to impose your belief structure upon them? What a group of adults does, consentually and amongst themselves is of no concern to you, or to me. It's simply none of our business. I think most people have their hands full trying to run their own lives; let alone having the wisdom, skill and intelligence to attempt to run somone else's.