You cannot identify conservative thought until you are able to separate your own personal values system from that of a moral society's. It may not matter to you if people aren't physically harming others or the property of others, but it mattered a great deal to the Founders and it matters to conservatives what KIND of people make up a society.
Crack being sold in pharmacies and prostitutes soliciting outside of schools (neither of which cause physical harm or harm property) harm SOCIETY itself. Once society starts declaring that sodomy is a RIGHT, it has strayed off a moral course and is headed towards destruction.
"Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other." John Quincy Adams
"Government is a contrivance of human wisdom to provide for human wants. These wants should be provided for, [including] the want of a sufficient restraint upon their passions." Edmund Burke, father of conservatism
Now, prostitution in legal in Nevada, and while I've never been there, I'm pretty sure there are no cat houses next to the local elementary school. Again, this is where local control governs, and probably does it well.
My entire point is my separating my own value system from that of society's. I just want to separate yours and Santorum's too.
Society can't declare sodomy a right. But neither can the state declare it unlawful. There is no "compelling interest." Just because something is a sin, doesn't mean it's a crime.