What kind of weapon is sex? Scholarship on the Lebanese Civil War (1975-90) has broadened the “war story” by foregrounding women’s perspectives as fighters and by adding complexity to militiamen’s narratives. Yet, while gendering the analysis, scholarship has not examined the role that sexual relations and sexual practices played in the war. Meanwhile, Lebanese Civil War–era cultural production, including films, novels and popular magazines, display sexual transactions and sexual violence as if they were common instances in the war. In this article, I engage an intertextual ethnographic reading of sex and sexual violence, combining the civil war’s cultural archive with oral histories that I conducted with former militiamen and militia women across Lebanon’s political spectrum, and with cis- and trans-women who had transactional sex with militia members, as well as urban participatory mapping and interviews with other participants in the war. Mapping the sex economy and sexual relations in the war reveals the central roles that sex played both as a traffic in and of itself, and as a tool of political governance of civilians, through a traffic in women. I argue that militias used sex and the threat of it for multiple purposes: as a form of mobility that enabled other goods to circulate more smoothly; as a tool of intra-sectarian extraction and coercion and as a weapon of patriarchal governance that kept civilians in their designated neighborhoods. While sex enabled cross-sectarian connections, the violent use of sex thus also reinforced sectarian social boundaries. My findings build on scholarship that has foregrounded the political economy of the war and on intersectional feminist analyses of political governance in Lebanon. The article is indebted to this scholarship as well as to ongoing civil society efforts to document sexual violence in the war.