It may, however, be supposed that this feeling, though belonging to human nature, has been restrained by certain conditions which have made it necessary, or desirable, for a man to share his wife with other men. Thus polyandry now prevails in several parts of the world. But I shall endeavour to show, later on, that this practice is due chiefly to scarcity of women, and commonly implies an act of fraternal benevolence, the eldest and first married brother in a family giving his younger brothers a share in his wife, if they would otherwise be obliged to live unmarried. Hence polyandry can by no means, as Mr. McLennan suggests, be regarded as “a modification of and advance from promiscuity.” It owes its origin to causes, or a cause, which never would have produced general communism in women. Besides, it can be proved that polyandry is abhorrent to the rudest races of men. It has been suggested, too, that man’s gregarious way of living made promiscuity necessary. The men of a group, it is said, must either have quarrelled about their women and separated, splitting the horde into hostile sections, or indulged in promiscuous intercourse. But it is hard to understand why tribal organization in olden times should have prevented a man having his special wife, since it does not do so among savages still existing. Primitive law is the law of might; and it is impossible to believe that the stronger men, who generally succeeded in getting the most comely women, voluntarily gave their weaker rivals a share in their precious capture. Regarding the aborigines of Queensland, Lumholtz states that as a rule, it is difficult for men to marry before they are thirty years of age, the old men having the youngest and best-looking wives, while a young man must consider himself fortunate if he can get an old woman.[749] It more commonly happens among savages, however, that almost every full-grown man is able to get a wife for himself; and when this is the case, there is still less reason for assuming communism in women. It is not, of course, impossible that, among some peoples, intercourse between the sexes may have been almost promiscuous. But there is not a shred of genuine evidence for the notion that promiscuity ever formed a general stage in the social history of mankind. The hypothesis of promiscuity, instead of belonging, as Professor Giraud-Teulon thinks,[750] to the class of hypotheses which are scientifically permissible, has no real foundation, and is essentially unscientific. CHAPTER VII MARRIAGE AND CELIBACY With wild animals sexual desire is not less powerful as an incentive to strenuous exertion than hunger and thirst. In the rut-time, the males even of the most cowardly species engage in mortal combats; and abstinence, or at least voluntary abstinence, is almost unheard of in a state of nature.[751]