We need a much better word, or a set of words, but then we would have to agree on what morality is and that's the big public struggle. The general definition is too vague to be meaningfull without some elaboration.
Sex is never immoral.
Force or fraud, that is immoral. On the contrary, I find this makes the meaningful discussion of morality possible. There are two logical fallacies in these statements. First is that 'good' by which I assume you mean morally right, is presupposed, which is of course circular reasoning. Second fallacy is that in your claim that discussion could only be between inherently simillar beliefs, you presuppose that morality is in fact subjective, again relying upon circular reasoning.