The authors examined the role of fantasy as an internal drive mechanism
for repetitive acts of sexual violence. A sample of 25 serial sexual
murderers with three or more known victims each was compared with a sample
of 17 single sexual murderers, with only one known victim each. The drive
mechanism was hypothesized to be an intrusive fantasy life manifested in
higher prevalences of paraphilias, documented or self- reported violent
fantasies, and organized crime scenes in the serial murderers. All three
hypotheses were supported.