[baggins]

what makes you think that Sin is breaking some rule?

Sin is the condition of your heart if you are allowing anything other than Christ to rule your heart. it is the separation from God.

or, from my protestant catechism "Sin is all in thought, word, and deed that is contrary to the will of God."

Sin is not just breaking some rule or law.

also, in some cases, sin can be a relative thing. some actions may not cause you to stumble in your faith or represent Christ horribly. and for some other people, those same actions my be a huge trial they are attempting to overcome, and for them to partake in such an activity would represent Christ horribly.