>A variety of tentative unions gradually took the place of indiscriminate relations. Among the Orang Sakai of Malacca a girl remained for a time with each man of the tribe, passing from one to another until she had made the rounds; then she began again: Among the Yakuts of Siberia, the Botocudos of South Africa, the lower classes of Tibet, and many other peoples, marriage was quite experimental, and could be ended at the will of either party, with no reasons given or required. Among the Bushmen "any disagreement sufficed to end a union, and new connections could immediately be found for both.". Among the Damaras, according to Sir Francis Galton, "the spouse was changed almost weekly, and I seldom
knew without inquiry who the pro tempore husband of each lady was at any particular time." Among the Baila "women are bandied about from man to man, and of their own accord leave one husband for another. Young women scarcely out of their teens often have had four or five husbands, all still living."·

>In a few cases we find "group marriage," by which a number of men belonging to one group married collectively a number of women belonging to another group.to In Tibet, for
example, it was the custom for a group of brothers to marry a group of sisters, and for the two groups to practise sexual communism between them, each of the men cohabiting with each of the women." Caesar reported a
similar custom in ancient Britain.1& Survivals of it appear in the "levirate," a custom existing among the early Jews and other ancient peoples, by which a man was obligated to marry his brother's widow; l. this was the rule that so irked Onan.