This article is part of a project about transformations of relatedness among the Luo of western Kenya, which we examine by observing, in the everyday life of one village, concrete practices that constitute and negotiate material contact. In short, villagers understand physical touch and associated forms of material contact as practices that momentarily merge persons or their bodies by sharing substance. Such moments of merging release creative or transformative force, with its attendant ambiguity. To understand this link between merging and emergence, the Dholuo term riwo, is helpful. It can designate moments of 'coming together, mixing, merging' across all spheres of everyday life. Riwo is central to concerns with how things should be done, in everyday and in ritual situations, in order to sustain the order of life, commonly referred to as chike, which directs the 'growth' (dongruok) of the living. Since there is, in these times of death and confusion, little agreement among the villagers about how the continuity of life can be maintained, and which order should be created or restored, moments of physical contact (or its absence) are nodes around which the present predicament is debated, and alternative visions of past and future are produced. The present paper looks at one aspect of these debates: bodily intercourse between woman and man. We discuss how this practice, which among Luo tends to be associated with darkness and the absence of words, is increasingly drawn into the light of discourses - such as Christian, Traditionalist, medical and pornographic - which have emerged in western Kenya at different times during the past century, and which in different ways constitute 'sex' as a distinctive imagination of intercourse.