82:3.11

Some tribes married the young men to the widows and older women and then, when they were subsequently left widowers, would allow them to marry the young girls, thus insuring, as they expressed it, that both parents would not be fools, as they conceived would be the case if two youths were allowed to mate. Other tribes limited mating to similar age groups. It was the limitation of marriage to certain age groups that first gave origin to ideas of incest. (In India there are even now no age restrictions on marriage.)