In a recent article Looman and Marshall (2005) questioned the validity of phallometric assessment of rapists based on the results of a study of incarcerated rapists and child molesters. In this commentary we offer (1) a critique of the methods used and conclusions reached by Looman and Marshall and (2) a discussion of important methodological issues relevant to phallometry. We conclude that the correct inference from Looman and Marshall's study is that rapists, as a group, show a pattern of sexual arousal to audiotaped scenarios of coercive and non-coercive sex that significantly differs from the pattern of groups of non-sex offenders, in agreement with the general literature on this question.
Abel, G.G., Barlow, D.H., & Blanchard, E.B. (1977). The components of rapists' sexual arousal. Archives of General Psychiatry, 34, 895-903.
2.
Barbaree, H.E., Marshall, W.L., & Lanthier, R.D. (1979). Deviant sexual arousal in rapists. Behaviour Research and Therapy, 17, 215-222.
3.
Baxter, D.J., Barbaree, H.E., & Marshall, W.L. (1986). Sexual responses to consenting and forced sex in a large sample of rapists and nonrapists. Behaviour Research and Therapy, 24, 513-520.
4.
Blanchard, R., Klassen, P., Dickey, R., Kuban, M., & Blak, T. (2001). Sensitivity and specificity of the phallometric test for pedophilia in nonadmitting sex offenders. Psychological Assessment,13, 118-126.
5.
Chaplin, T.C., Rice, M.E., & Harris, G.T. (1995). Salient victim suffering and the sexual responses of child molesters. Journal of Consulting and Clinical Psychology , 163, 249-255.
6.
Côté, K., Earls, C.M., & Lalumière, M.L. (2002). Birth order, birth interval, and deviant sexual preferences among sex offenders. Sexual Abuse: A Journal of Research and Treatment, 14, 67-81.
7.
Harris, G.T., & Rice, M.E. (2003). Actuarial assessment of risk among sex offenders . In R. Prentky, E. Janus, & M. C. Seto (Eds.), Sexual coercive behavior: Understanding and management (vol. 989). New York: Annals of the New York Academy of Sciences.
Harris, G.T., Rice, M.E., Quinsey, V.L., Lalumière, M.L., Boer, D., & Lang, C. (2003). A multi-site comparison of actuarial risk instruments for sex offenders. Psychological Assessment, 15, 413-425.
10.
Knight, R.A., & Sims-Knight, J.E. (2003). The developmental antecedents of sexual coercion against women: Testing alternative hypotheses with structural equation modeling. In R. A. Prentky, E. Janus, & M. Seto (Eds.), Sexual coercion: Understanding, and management (vol. 989). New York: Annals of the New York Academy of Sciences.
11.
Lalumière, M.L., Harris, G.T., Quinsey, V.L., & Rice, M.E. (2005). The causes of rape: Understanding individual differences in the male propensity for sexual aggression. Washington : American Psychological Association.
12.
Lalumière, M.L., & Quinsey, V.L. (1994). The discriminability of rapists from non-sex offenders using phallometric measures: A meta-analysis. Criminal Justice and Behavior, 21, 150-175.
13.
Lalumiere, M.L., Quinsey, V.L., Harris, G.T., Rice, M.E., & Trautrimas, C. (2003). Are rapists differentially aroused by coercive sex in phallometric assessments? Annals of the New York Academy of Sciences, 989, 211-224.
14.
Looman, J. (2000). Sexual arousal in rapists as measured by two stimulus sets. Sexual Abuse: A Journal of Research and Treatment, 12, 235-248.
15.
Looman, J. (2006). Correction to Looman and Marshall 2005. Criminal Justice and Behavior, 33, 565-567.
16.
Looman, J. & Marshall, W.L. (2005). Sexual arousal in rapists . Criminal Justice and Behavior, 32, 367-389.
17.
Marshall, W.L., Barbaree, H.E., & Christophe, D. (1986). Sexual offenders against female children: Sexual preferences for age of victims and type of behavior . Canadian Journal of Behavioural Science, 18, 424-439.
18.
Marshall, W.L., & Fernandez, Y.M. (2003). Sexual preferences: Are they useful in the assessment and treatment of sexual offenders? Aggression and Violent Behavior, 8, 131-143.
19.
Quinsey, V.L., Chaplin, T.C., & Vamey, G. (1981). A comparison of rapists' and non-sex offenders' sexual preferences for mutually consenting sex, rape, and physical abuse of women. Behavioral Assessment, 3, 12.
20.
Rice, M.E., Chaplin, T.C., Harris, G.T., & Coutts, J. (1994). Empathy for the victim and sexual arousal among rapists and nonrapists. Journal of Interpersonal Violence , 9, 435-449.
21.
Rice, M.E., Quinsey, V.L., & Harris, G.T. (1991). Sexual recidivism among child molesters released from a maximum security psychiatric institution. Journal of Consulting and Clinical Psychology, 59,381-386.
