From the Journal of Forensic and Legal Medicine (2009)
Major characteristics of the 10 classes of necrophiles
Do not want to have sex with a dead person. Enjoy sex with a living person pretending to be dead.
Bereaved people, who would mummify a part of the body of their recently departed loved ones, and keep it with them in order to get a psychosexual stimulation. Would not show a similar interest in any other dead body, i.e. body of a person with whom they were not romantically involved in life.
Fantasize intercourse with the dead. May visit cemeteries and funeral parlors and may masturbate in the presence of the dead.
Interest in dead bodies increases to the level of touching them. Like to stroke erotic parts of a dead body, such as breasts, May manipulate sexual organs of the dead in order to get an orgasm.
Cut up parts of a dead body - say a breast - mummify it, and keep it in their possession to use it as a fetish for their necrophilic activities. Differ from Class II necrophiles in the sense that they (Class V) do it with the bodies of strangers with whom they held no romantic relationship in life. Thus they do not merely fill a psychosexual vacuum left by the death of their loved ones.
Interest in dead bodies is more than merely touching them. Necrophilic pleasure comes from mutilating a dead body.
Actual sexual activity with the dead starts from this class. Normally, these necrophiles would be content to have sexual intercouse with the living, but if an opportunity arose, would not refrain from having sexual intercourse with the dead. Necrophilic mortuary attendants belong to this class.
The so-called “classic” necrophiles. They do not enjoy sexual intercourse with the living and prefer dead bodies for intercourse. They can however have sex with both living and dead persons. In this sense they differ from Class X necrophiles, who can have sex only with dead persons
This penultimate category is the most dangerous of all, in the sense that they would kill a person in order to have intercourse with him or her. They are however capable of having sexual intercourse with the living, but the need for sexual intercourse with the dead is so great that they must kill human beings in order to have sexual intercourse with their dead bodies.
Sexual intercourse is possible only with the dead, with the complete exclusion of living partners.