From this hypothetic beginning, primitive marriage may be traced through the various observed stages of monogamy and polygamy and concubinage and wife-subordination, through savagery and barbarism and into civilization, with its curious combination of exoteric monogamy and esoteric promiscuity.
"The Siouan Indians"
W. J. McGee
Adoption is common, concubinage rare; each being on a level with marriage in respect to the status of the children.
"The Ethnology of the British Colonies and Dependencies"
Robert Gordon Latham
Under such rule, polygamy, concubinage, and adultery are not tolerated.
"The Ethnology of the British Colonies and Dependencies"
Robert Gordon Latham