Necrophilia is completely different from thanatophillia.
Additionally, criminologist Lee Mellor's typology of homicidal necrophiliacs consists of eight categories (AH) and is based on the combination of two behavioral axes: destructive (offender mutilates the corpse for sexual reasons)  preservative (offender does not), and cold (offender used the corpse sexually two hours or more after death)  warm (offender used the corpse sexually less than two hours after death)
 Necrophilic amplexus in frogs may occur because males will mount any pliable object the size of an adult female

