He is also the primary editor of "Understanding Necrophilia: A Global Multidisciplinary Approach" (2017) with Anil Aggrawal and Eric W. Hickey. His chapters "Wider Shades of Pale" and "Mincing Words" examine flaws in the current definition of necrophilia and argue for an expansion of the concept to include acts of sexually motivated post-mortem mutilation, posing, and "trophy-taking", as well as certain types of cannibalism and vampirism. In "Necrophilia-Spectrum Behavior and the Thematic-Derivative Model of Sexual Progression", Mellor offers a model which charts both normophilic and paraphilic sexual interests, using the case of Armin Meiwes as an example. His "Five Allures of Necrophilia" proposes that there are five basic appeals of necrophilia: passivity/inertia, corporeal/sensory, reminiscent/identity, ritual/iconographic, and spiritual/magical.