LeafByNiggle:
I just showed that you yourself believe there is an objective morality, based on what you would do with the police to force me to make restitution for the silverware I took (and now the smashed TV too.)
Laws have nothing to do with morality. Open marriage? Perfectly legal, and the eyes of some people it is immoral. By the way, the concept of private property is not eternal either.
If you would argue that morality is the commonly acceptable norms of behavior in a specific society at a certain period of time, then you would be closer to realty. You could call it objective, but definitely not absolute.