According to Maclver following are the functions of mores-
They both compel behavior and forbid it. They are forever molding and restraining the tendency of every individual. In other words they are the instruments of control. In society there are innumerable mores like monogamy, anti-slavery, democracy and prohibition conformity to which is regarded as necessary.
By conforming to the mores the individual gains identification with his fellows and maintains those social bonds which are essential for satisfactory living.
The mores hold the members of the groups together. The members of the group though characterized by the consciousness of the kind are also competing with one another by the good things of this life and status. They are held in line by the constraints of mores. There is a sense of unreflecting solidarity among people who share the same mores because their sentiments are alike. It also implies that there is a sense of resistance and antagonism towards anyone with different mores. There are mores for each sex for all classes and for all groups whose function is to maintain the solidarity of the group.