Thus, from whatever angle we view group-marriage, its polygyny and its polyandry seem to rest on monogamy. This is true also of forms of group-marriage other than those mentioned above. Where the theft of women still continues to be a practice more serious than are the somewhat playful survivals that occur in the marriage ceremonies of cultural peoples, the one who wishes to steal a wife not infrequently secures confederates for his undertaking. Custom then commonly gives these companions a certain right to the stolen woman. This right, of course, is for the most part temporary, but it may nevertheless come to approximate the conditions of group-marriage in case the first man assists his confederates in the same way in which they have aided him. There is still another and a related motive that may lead to the same result. When a woman enters into marriage with a man of a certain tribe, she at once enters into very close relations with the tribe itself. Where tribal association has gained a preponderant importance, custom sometimes grants to all the male members of the tribe certain transient rights with respect to the woman on the occasion of her marriage. This occurs particularly when the man and woman belong to different tribes--that is, in the case of exogamy, an institution characteristic of the totemic age and to be considered later. For, the lively consciousness of kinship differences naturally tends to strengthen the right of appropriation belonging to the entire tribe. A similar thought is reflected in the mediæval _jus primæ noctis_ of certain provinces of France and Scotland, except that in place of the right of the kinship group to the possession of the individual we here find the authority of the lord over his vassals.
Thus, all these phenomena, belonging in part to the transitional stage between monogamy and polygamy and in part to a combination of the two forms of polygamy, namely, polygyny and polyandry, point to monogamy as the basal form of marriage, and that form from which, under the influence of particular conditions, all others have developed. Whether or not we regard it as probable that the system of maternal descent was at one time universal, no argument for the existence of an original promiscuity can be based upon it. If we call to mind the close association of the youths and men of the kinship group in the men's house, it will be apparent that such conditions of social intercourse make for a particularly intimate bond between mother and children. Before his entrance into the community of men, the boy lives in the company of the women. This close association between mother and children is sufficient to account for the origin of maternal descent. But, owing to the gradual change of cultural conditions, it is to be expected that maternal descent should pass over into paternal descent as soon as more positive conceptions of authority and property are formed. Moreover, the possibility also remains that among some tribes paternal descent prevailed from the very outset; positive proof is here not available. We cannot, of course, deny the possibility that under certain cultural conditions man exercised the decisive influence from the very beginning, as early, indeed, as one may speak of clan membership and hereditary succession. The most primitive stage of culture, as we shall see in the following discussion, lacks the conditions for either maternal or paternal descent, inasmuch as it possesses neither clearly defined clans nor any personal property worth mention.