18+ ( ADULT CONTENT) Harem (genre)-Structure:- Because romance is rarely the main focus of an entire series, harem structure is ambiguous. The most distinguishable trait is arguably the group of girls who accompany, and in some instances cohabitate with the boy, and while intimacy is just about customary, it is never necessary; when it is present, there must be a minimum of two girls who express it. Additionally, it is not essential for there to be one exclusive boy; many can exist as long as they are given less attention or the story calls for an unusually obscure sex ratio.