E. B. Tylor thinks that the treatment of the son-in-law on the part of the mother-in-law is nothing more than a form of ‘cutting’ on the part of the woman’s family. The man counts as a stranger, and this continues until the first child is born. But even if no account is taken of cases in which this last condition does not remove the prohibition, this explanation is subject to the objection that it does not throw any light on the custom dealing with the relation between mother-in-law and son-in-law, thus overlooking the sexual factor, and that it does not take into account the almost sacred loathing which finds expression in the laws of avoidance[30]. A Zulu woman who was asked about the basis for this prohibition showed great delicacy of feeling in her answer: “It is not right that he should see the breasts which nursed his wife.”[31] It is known that also among civilized races the relation of son-in-law and mother-in-law belongs to one of the most difficult sides of family organization. Although laws of avoidance no longer exist in the society of the white races of Europe and America, much quarrelling and displeasure would often be avoided if they did exist and did not have to be re-established by individuals. Many a European will see an act of high wisdom in the laws of avoidance which savage races have established to preclude any understanding between two persons who have become so closely related. There is hardly any doubt that there is something in the psychological situation of mother-in-law and son-in-law which furthers hostilities between them and renders living together difficult. The fact that the witticisms of civilized races show such a preference for this very mother-in-law theme seems to me to point to the fact that the emotional relations between mother-in-law and son-in-law are controlled by components which stand in sharp contrast to each other. I mean that the relation is really ‘ambivalent’, that is, it is composed of conflicting feelings of tenderness and hostility. A certain part of these feelings is evident. The mother-in-law is unwilling to give up the possession of her daughter; she distrusts the stranger to whom her daughter has been delivered, and shows a tendency to maintain the dominating position, to which she became accustomed at home. On the part of the man, there is the determination not to subject himself any longer to any foreign will, his jealousy of all persons who preceded him in the possession of his wife’s tenderness, and, last but not least, his aversion to being disturbed in his illusion of sexual over-valuation. As a rule such a disturbance emanates for the most part from his mother-in-law who reminds him of her daughter through so many common traits but who lacks all the charm of youth, such as beauty and that psychic spontaneity which makes his wife precious to him.