Who cares about sin? Why are we talking about what's a sin at a liberty site? Libertarians aren't concerned with sin except in their own personal lives. It's between you and your god.
If it doesn't violate your rights, don't worry about it. That's the cornerstone of liberty. If you haven't figured out that most basic of tenets by this time, you're a lost cause.
"In reality, the Constitution itself is incapable of achieving what we would like in limiting government power, no matter how well written."
~ Ron Paul, End the Fed