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Sexual Abuse: A Journal of Research and Treatment
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Penile-Response Profiles of Sexual Aggressors During Phallometric Testing

Patrick Michaud

University of Montreal, Quebec, Canada, patrick.michaud{at}umontreal.ca

Jean Proulx

University of Montreal, Quebec, Canada

This study analyzes sexual-preference profiles in a sample of 420 sexual aggressors who exhibited a valid profile during their initial phallometric assessment. The sexual stimuli used in the process were audiotapes describing sexual-offending scenarios. Two types of sexual stimuli sets were used: one developed for sexual aggressors against women and a second developed for sexual aggressors against children. Penile responses were recorded during stimulus presentation using a mercury-in-rubber strain gauge. Classification analyses (hierarchical and K-means clustering combination) were conducted separately for three groups of sexual aggressors: (a) sexual aggressors against children (n = 253), (b) sexual aggressors against women (n = 138), and (c) mixed sexual aggressors (n = 29). The sexual aggressors against children exhibited four penile-response profiles, the sexual aggressors against women two penile-response profiles, and the mixed sexual aggressors only one penile-response profile. In addition, analyses carried out on randomly split subsamples established that the generated profiles for sexual aggressors against children and sexual aggressors against women were stable.

Key Words: phallometry • plethysmograph • sexual arousal • sexual deviance • sexual interests • typology

Sexual Abuse: A Journal of Research and Treatment, Vol. 21, No. 3, 308-334 (2009)
DOI: 10.1177/1079063209342073
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