As in the Republic, physical considerations seem almost to exclude moral and social ones.

To modern feelings there is a degree of coarseness in Plato's treatment of the subject.

Yet he also makes some shrewd remarks on marriage, as for example, that a man who does not marry for money will not be the humble servant of his wife.
And he shows a true conception of the nature of the family, when he requires that the newly-married couple 'should leave their father and mother,' and have a separate home.

He also provides against extravagance in marriage festivals, which in some states of society, for instance in the case of the Hindoos, has been a social evil of the first magnitude.
In treating of property, Plato takes occasion to speak of property in slaves.

They are to be treated with perfect justice; but, for their own sake, to be kept at a distance.