I'm not sure I understand what you mean. What are the five principles that make up what is moral?

Also, not sure what you make of the questions I posed before? A question back to you would be what if pedophilia was considered "common sense" (as it was in Ancient Greece)? Would that justify marriage of adults and children? They certainly saw social benefit to these relationships and considered them to be fair in the sense that a younger boy would gain wisdom by virtue of being in relationship with older men.

Second, you said that incestuous marriage isn't okay because of gene…  Read moretic problems for the child. What about homosexual incestuous relationships? Would those be legitimate forms of marriage? There is no possibility of procreation, so theoretically, based on your argument above, the government would be unfair to extend the right of marriage to four homosexual brothers who have mutually consented to live with each other in a bond of love. Would you agree with that as a legitimate form of marriage?