Answer:
more, law
Explanation:
A married man in the United States with several mistresses is violating a more, but he is violating a law if he is married to more than one woman at the same time.
A more is a moral code of behaving in a society, while it is not law, it is the expected way an individual should be behave in a society. Foe example it is not acceptable for a married man to be having extra marital affairs but it also not legally a crime while on the other hand, marrying more than one wife is a crime as stipulated by the laws of the United States and an individual guilty of such can be sued.