Jeffrey Dahmer was one of the most notorious American serial killers, sex offenders, and necrophiliacs. Catathymic necrophiliacs commit postmortem sex acts only while in a sudden impulsive state. Some necrophiliacs only fantasise about the act, without carrying it out. John Waters proclaimed "Nekromantik" "the first ever erotic film for necrophiliacs". There has not been a sufficient number of necrophiliacs to establish any effective treatments. However, in the past, necrophiliacs have expressed having more than one motive.