" Bachofen, furthermore, is perfectly right in contending that the transition from what he calls "hetaerism" or "incestuous generation" to monogamy was brought about mainly by women. The more in the course of economic development, undermining the old communism and increasing the density of population, the traditional sexual relations lost their innocent character suited to the primitive forest, the more debasing and oppressive they naturally appeared to women; and the more they consequently longed for relief by the right of chastity, of temporary or permanent marriage with one man. This progress could not be due to men for the simple reason that they never, even to this day, had the least intention of renouncing the pleasures of actual group marriage. Not until the women had accomplished the transition to the pairing family could the men introduce strict monogamy—true, only for women. The "

― Friedrich Engels , The Origin of the Family, Private Property and the State