Chapter 5 Measurement of Male Sexual Arousal and Interest Using Penile Plethysmography and Viewing Time Robin J. Wilson and Michael H. Miner Introduction The precise reasons why some people engage in sexually inappropriate conduct are unknown; although many theories exist. Some suggest sexual interests and prefer- ences are learned (Bem, 1996 ) while others question whether people might be born with certain sexual interests or preferences (Seto, 2008 , 2012 ). While this distinc- tion may have implications for larger discussions regarding sexual orientation, there are also implications for professionals working in sexual violence prevention. Research has shown that people who have sexually offended are at higher risk to do so again if they experience inappropriate sexual arousal (Hanson & Bussière, 1998 ; Hanson & Morton-Bourgon, 2005 ). Therefore, knowing about a client’s sexual interests and preferences is an important part of the assessment and risk manage- ment process. However, in talking to clients during forensic psychosexual evalua- tions, it is often diffi cult to ensure truthful responding due to the consequences associated with being labeled sexually deviant or a risk to others. Some people in trouble for sexually inappropriate conduct will openly admit to having strong sexual interest in or even a sexual preference for abnormal targets (e.g., children, animals, fetish items) or behaviors (e.g., exposing, peeping, bondage, and discipline), but this is by no means commonplace. R. J. Wilson , Ph.D., A.B.P.P. (*) Wilson Psychological Services LLC , 4047 Bee Ridge Road, Suite C , Sarasota , FL 34233 , USA Department of Psychiatry & Behavioural Neurosciences , McMaster University , Hamilton , ON , Canada e-mail:
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