The most superficial student of social customs quickly discovers the practically unlimited extent to which public opinion has always regulated marriage. If the traditions of one tribe were endogamous, all the men dutifully married within it; but if the customs of another decreed that wives must be secured by capture or purchase, all the men of that tribe fared forth in order to secure their mates. From the primitive Australian who obtains his wives in exchange for his sisters or daughters, and never dreams of obtaining them in any other way, to the sophisticated young Frenchman, who without objection marries the bride his careful parents select for him; from the ancient Hebrew, who contentedly married the widow of his deceased brother because it was according to the law, to the modern Englishman who refused to marry his deceased wife's sister because the law forbade it, the entire pathway of the so-called uncontrollable instinct has been gradually confined between carefully clipped hedges and has steadily led up to a house of conventional domesticity. Men have fallen in love with their cousins or declined to fall in love with them, very much as custom declared marriages between cousins to be desirable or undesirable, as they formerly married their sisters and later absolutely ceased to desire to marry them. In fact, regulation of this great primitive instinct goes back of the human race itself. All the higher tribes of monkeys are strictly monogamous, and many species of birds are faithful to one mate, season after season. According to the great authority, Forel, prostitution never became established among primitive peoples. Even savage tribes designated the age at which their young men were permitted to assume paternity because feeble children were a drag upon their communal resources. As primitive control lessened with the disappearance of tribal organization and later of the patriarchal family, a social control, not less binding, was slowly established, until throughout the centuries, in spite of many rebellious individuals, the mass of men have lived according to the dictates of the church, the legal requirements of the state, and the surveillance of the community, if only because they feared social ostracism. It is easy, however, to forget these men and their prosaic virtues because history has so long busied herself in recording court amours and the gentle dalliances of the overlord.