...What has monogamy or polygamy or polyandry to do with this matter? Iassume that it is undeniable that motherhood is woman's most manifestfunction... 
Various 「Mother Earth, Vol. 1 No. 2, April 1906」
...Strict monogamy, with the equality of duties of husband and wife, is the remedy for the disease...
Sidney L. Gulick 「Evolution Of The Japanese, Social And Psychic」
...Among the retainers, monogamy was practiced...
Raymond King Cummings 「The White Invaders」
...Cole-be, Bennillong's friend, had two female companions; and we found, indeed, more instances of plurality of wives than of monogamy...
David Collins 「An Account of the English Colony in New South Wales, Vol. 1」
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