To resume, monogamy is by far the most widespread form of marriage.
(c) Does it not tend towards, and is it not fostered by, monogamy?
Then they need desperately to know, "What is the case for monogamy?"
What has monogamy or polygamy or polyandry to do with this matter?
Monogamy was encouraged, and the idea of home came into being.
There are moral advantages in monogamy ...