The predictive value of the Card/Farrall Penile Plethysmograph Audio-Visual Stimulus Materials (Card/Farrall Stimuli3 was tested against three variables derived from a study by Freund of historical differences between gynephiles and pedophiles. Fifty-two sexual offender records were chosen at random from the files of a community-based clinic. Subjects were divided into gynephile and pedophile classifications on both the historical and the plethysmographic measures. A chi-square statistical evaluation of the correspondence between the historical and the plethysmographic measures discriminating between gynephiles and pedophiles demonstrated a level of correspondence between the two at the 0.01 level of confidence. Some theoretical issues in the development and use of plethysmographic stimulus materials are discussed.
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