Although a favourable position for women is usually anticipated where they occupy important economic roles in the context of matrilineal descent, such a position may well exist in a patrilineal society, especially if women organise as in West Africa. Here there exist well-organised women's cult associations which are well known from Liberia and Sierra Leone and occur also in western Cameroon and south-eastern Nigeria. The present article demonstrates the existence of a comparable women's association in middle-belt Nigeria among the Kulere. The article focuses mainly on the manner in which through the cooperation of certain men's and women's associations ‘gender symmetry’ was ritually expressed in the sphere of agriculture and fertility. The practical foundation of this symmetry in fertility cults was a relatively even division of labour between the sexes and a favourable position for women in marriage, since they could decide independently whether to stay with a husband or leave him. Cult associations were predominant in public life. Women were strictly excluded from men's associations which held political–ritual offices and channelled advantages in ritual consumption to men. Notwithstanding this exclusion, women had their own association in which they could regulate their own affairs as well as pass decisions for the whole community including the men. The women's organisation held major responsibilities for the protection and the fertility of the fields, both practically as well as ritually. In this responsibility the women's association cooperated with a men's association which otherwise intimidated women. This association of males protected the fields through the presence of supernatural guardians which was sometimes staged in masquerades. The corresponding duties and cooperation of both associations were enacted ritually through the use of common shrines and when the women contacted water spirits to increase the harvest under the protection of male masqueraders. The Kulere case shows a patrilineal society where women had a relatively independent position which was publicly acknowledged through gender dualism in the ritual organisation of agriculture in which their special capabilities with respect to fertility and sustainability were recognised.