Females and males in every society known to anthropology perform different economic activities. This gender division of labor has often been cited as a reason for marriage.12 As long as there is a division of labor by gender, society has to structure a way for women and men to share the products of their labor. Marriage would be one way to solve that problem. But it seems unlikely that marriage is the only possible solution. The hunter-gatherer rule of sharing could be extended to include all the products brought in by both women and men. Or a small group of men and women, such as brothers and sisters, might be pledged to cooperate economically. Thus, although marriage may solve the problem of sharing the fruits of a division of labor, it clearly is not the only possible solution.