Where does your morality come from, and who sanctions it?

Over the past many weeks, subjects have come up about having relations with an animal, young women of 15yr seducing a man over 18yrs, to what is legal vs. moral. Many seem to believe that morals are stand-alone, they need no religious foundation. If morality is stand-alone, whose morality is it? Who decided that this is moral, but that is not moral? If you cannot get people to adhere to it, is it still just as moral? Is morality based off how popular it is, because most people want to say a certain thing, or act, is moral? If a majority body of people deem something moral, who is to say they are right? Who authorized their morality to be more moral than a minority? Where did your morality come from, and who sanctioned it to be moral?