The Validity of Phallometric Assessment With Rapists: Comments on Looman &; Marshall (2005)

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.     

Static and dynamic predictors of recidivism in sexual aggressor

The aim of this stydy was to verify whether static factors (criminal history, age, relationship status) and dynamic factors (deviance index based on phallometric data, score of psychometric testing) permit prediction of recidivism in sexual aggressors. Three types of recidivism (sexual, violent, criminal) were determined in 113 rapists and in 269 child molesters over an average follow-up of 64.5 months. The sexual reconviction rate was 21.2% in rapists and 13% in child molesters. Reconvicted rapists were younger and had more previous convictions than those who were not reconvicted. Compared with those who did not reoffend, the child molesters who were reconvicted for a sexual offense had higher pedophilic indices, had more previous sexual charges, were younger, more frequently had male victims, had more frequently extrafamilial victims, and a higher percentage of them were living alone. Psychometric data did not predict recidivism in either rapists or child molesters.     

Childhood Attachment,Childhood Sexual Abuse,and Onset of Masturbation Among Adult Sexual Offenders

Written autobiographies of 48 incarcerated adult male sexual offenders (22 rapists, 13 intrafamilial child molesters, and 13 extrafamilial child molesters) were used to generate retrospective self-report measures of their childhood maternal and paternal attachment, childhood sexual abuse experiences, and onset of masturbation. Contrary to expectation, the offenders as a combined group more often reported secure than they did insecure childhood maternal and paternal attachment. There were no differences between the three offender subgroups with respect to maternal attachment; however the rapists and the intrafamilial child molesters were more likely to report insecure paternal attachment than were the extrafamilial child molesters. There were no differences between these offender subgroups in the frequency with which childhood sexual abuse was reported. However, offenders with insecure paternal attachment were more likely to report having been sexually abused than were those with secure paternal attachment. Sexually abused offenders in turn reported earlier onset of masturbation than did those who were not sexually abused. These results are consistent with contemporary attachment models linking insecure childhood attachment to childhood sexual abuse, and with traditional conditioning models linking childhood sexual abuse, early masturbation, and sexual offending.     

Use of Visual Reaction Time to Assess Male Adolescents Who Molest Children

With the recent realization of the extent to which adolescents are committing sexual offenses, researchers have attempted to identify valid and reliable assessment instruments for this population. Some such assessment instruments (i.e., plethysmography, self-report) have met with criticism relative to their utility with juvenile offenders. The present study aimed to assess the validity of the Abel Assessment for sexual interest (AASI) with male adolescents who have molested children. Results indicated that the amount of time male adolescent child molesters viewed slides of children was significantly longer than nonmolesters. Additionally, viewing time of slides of children for male adolescent child molesters was significantly correlated with their number of victims and the number of times they carried out acts of child molestation. These results support the AASI as a valid measure of sexual interest in adolescent male child molesters.     

Effect of Age-at-Release on Long Term Sexual Re-offense Rates in Civilly Committed Sexual Offenders

A cohort of 136 rapists and 115 child molesters civilly committed to a prison in Massachusetts and followed for 25 years (see Prentky, Lee, Knight, & Cerce, 1997) was examined for the effect of age at time of release on sexual recidivism. The present study (1) examined the recidivism rates for each of five age-at-release groups, separately for rapists and child molesters, (2) tested the fit of linear and quadratic models for 5, 10, 15, 20, and 25-year windows using Cox regression analysis, (3) presented the predicted failure rates for rapists (up to five years post-release) and child molesters (out 21 years post-release), and (4) provided a computational formula for estimating the sexual recidivism rate given an individual’s age and number of years post-release. For rapists, a linear model extending 5 years best captured our data (LR=5.62, p<.02). Going out any further than 5 years did not enhance the predictive efficacy of the model. By contrast, a quadratic model extending the full duration of the study (25 years) provided the best fit (LR=6.30, p<.04) for child molesters. Our data supported the general conclusion that risk of sexual recidivism diminishes as a function of increasing age at time of release for rapists. We found marked differences, however, in the re-offense patterns of rapists and child molesters, with the latter group evidencing a distinct quadratic, rather than linear, pattern. Since these findings derive from a population screened for civil commitment by virtue of their presumptive dangerousness, they may not be generalizable to samples of sex offenders drawn from the general prison population.     

Some aspects of social competence in sexual offenders

Outpatient rapists and child molesters were compared with a socioeconomically similar group of nonoffenders and with a group of university students on various measures of social functioning and in terms of their judgments about actors displaying under-, over-, and appropriately assertive behavior. The child molesters did not differ from the matched community group, with both groups reporting social anxiety, underassertiveness, and low self-esteem. These two groups also judged the unassertive actor to be the most appropriate of the three actors. The rapists thought the overassertive actor was the most appropriate and they also appeared more confident, more assertive, and less anxious than the child molesters. The university students were more socially appropriate, more confident, and less anxious than the other groups, and they made judgments about the actors that were consistent with prosocial expectations. Evidently the model of social functioning that these sexual offenders accepted differed from prosocial expectations, and this, as well as their actual functioning, needs to be addressed in research and treatment.     

Sexual Deviance and Number of Older Brothers Among Sexual Offenders

A number of studies have shown that the probability that a man is homosexual increases with the number of older brothers (but not sisters) bom to his mother. This older brother effect suggests that a progressive maternal immunosensitization process is involved in producing homosexual preferences. A recent demonstration of the older brother effect in homosexual pedophilia raises the question of whether it is involved in other anomalous sexual preferences as well. In the present study, phallometric data were gathered from 29 child molesters, 38 rapists, and 11 individuals who had offended against both children and adults. In all groups, a phallometric index of sexual deviance (a relative preference for children or for coercive sex) was positively correlated with the offenders' number of older brothers (but not sisters). These results suggest that the maternal immunosensitization hypothesis may explain some variations in male sexual preferences.     

Heterosocial perception in child molesters and rapists

This study was designed to investigate child molesters' and rapists' perceptions of women's affect and sexual desire in first-date situations. Videotaped presentations of heterosexual couples in first-date situations were presented to 18 heterosexual child molesters, 9 homosexual child molesters, 25 rapists, 27 nonviolent non-sex offenders, and 30 violent non-sex offenders. For each videotaped segment, subjects categorized the woman's affect as rejecting, bored, neutral, friendly, or romantic and estimated how much sexual activity she desired after the date. Heterosexual child molesters, relative to their control group (nonviolent nonsex offenders), reported lower estimates of sexual desire when the women exhibited friendly and romantic affect. Heterosexual molesters also reported lower estimates of sexual desire and exhibited poorer categorization of affect relative to violent non-sex offenders when the women displayed romantic affect. Rapists did not show predicted affect-categorization deficits and did not report higher estimates of women's sexual desire relative to their control group.We gratefully acknowledge Michael Brannick, Ellis Gesten, D. R. Laws, and Jonathan Cheek, who provided helpful comments on several drafts of this article. We also thank Roderick Hall of the Florida Department of Corrections and the staff at Zephyrhills Correctional Institution for their generous assistance during the data collection phase of this project.     

Identifying Schemas in Child Molesters,Rapists, and Violent Offenders

One focus of research concerning offending behavior has been the concept of the cognitive distortion, although the importance of the need for research into the underlying cognitive structures in offenders has been highlighted. This study examined schemas in child molesters, rapists, and violent offenders, predicting content differences in the offence-related schemas between these groups. In accordance with previous research, the prevalence of a “suspiciousness/hostility to women” schema in rapists was predicted. Twelve rapists, twelve child molesters, and twelve violent offenders incarcerated in a male maximum-security prison completed “Life Maps” (autobiographies) and the My Life questionnaire (R. E. Mann & C. R. Hollin, 2001), both designed to indicate the presence of schemas. A content analysis template containing nine schemas was constructed and applied to the Life Map data. Results showed a significant difference in the prevalence of schema type between the three groups. There was a prevalence of a “hostility/distrust of women” schema in the rapists. Analysis of the My Life questionnaire revealed a difference between violent offenders and rapists only. This study highlights the need for further research into schemas with sexual and violent offenders.     

Sexual Arousal in Rapists as Measured by Two Stimulus Sets

Some uncertainty exists in the literature regarding the status of phallometric testing with rapists. Although Quinsey and colleagues (1981) argue that rapists can be distinguished from nonsexual offenders with appropriate phallometric tests, Marshall (in press) argues that the validity of such testing is not proved, and that findings supportive of the testing are a artifact of population differences (i.e., psychiatric vs. correctional) and not reflective of rapists overall. The current study attempts to clarify this issue by testing rapists, child molesters, and mixed offenders (those with both adult and child victims) in a prison setting with both the Barbaree and Quinsey stimulus sets. It was hypothesized that rapists would be found to have more deviant rape indices when tested with the Quinsey stimulus set than with the Barbaree set. However, neither stimulus set distinguished the three groups in terms of the rape indices, whereas the rape index calculated from the Quinsey stimulus set was slightly more deviant than the one calculated from the Barbaree set. However, only 25% of rapists were classified as deviant using a rape index cutoff of 1.0. This finding is discussed in terms of the sexual preference hypothesis.     

Trait Empathy and Criminal Versatility in Sexual Offenders

Associations between trait empathy and criminal versatility were examined in a sample of 88 incarcerated adult sexual offenders (29 extrafamilial child molesters, 26 intrafamilial child molesters, and 33 rapists). Considerable criminal versatility was observed, with 60% of the whole sample and 88% of recidivist offenders having previous convictions for nonsexual offenses. Regression analyses showed significant associations between trait empathy and nonsexual offense convictions, but not between trait empathy and sexual offense convictions. More specifically, greater involvement in violent offending (e.g., assault, robbery) was associated with lower levels of empathic concern and higher levels of fantasy. Greater involvement in miscellaneous (e.g., traffic, drug, public order) offending was associated with lower levels of empathic concern. We argue that insufficient theoretical and empirical attention has historically been given to criminal versatility among sexual offenders, especially among child molesters. In particular, we suggest that developments in empathy training for sexual offenders may benefit from distinguishing needs of criminally versatile and non-versatile sexual offenders. More knowledge about trait empathy in sexual offenders, and about situational factors that may override otherwise normal empathic responsiveness, is needed.     

A Brief Screening Scale to Identify Pedophilic Interests Among Child Molesters

Among child molesters, phallometrically measured sexual interest in children is associated with having male victims, multiple victims, younger victims, and extrafamilial victims. These sexual offense history variables are also associated with risk for sexual recidivism. The present study of 1,113 child molesters was conducted to determine if these sexual offense history variables could be used as items in a brief screening scale to identify pedophilic interests (SSPI: Screening Scale for Pedophilic Interests). Using a cutoff score that classified 90% of a sample of 206 nonchild molesters as not having pedophilic interests, SSPI scores identified pedophilic interests among child molesters significantly better than did chance. In phallometric testing, individuals with the highest SSPI score were more than 5 times as likely to show pedophilic interests than individuals receiving the lowest score. The SSPI is not intended to be a substitute for phallometric testing, but it may be useful for triage and risk management when testing is difficult to conduct, or as a research instrument when phallometric data are unavailable.     

Sexual Offenders’ State-of-Mind Regarding Childhood Attachment: A Controlled Investigation

Attachment experiences have been regarded as significant by researchers and clinicians attempting to explain the etiology of sexual offending. Although initial studies have revealed some promising evidence, there are a number of theoretical and methodological problems with this preliminary body of work. While addressing these limitations, the goal of the present study was to investigate state-of-mind regarding childhood attachment among subtypes of sexual offenders, comparing them to both a sample of nonsexual offenders and to the documented patterns of nonoffenders. Sixty-one sexual offenders (extrafamilial child molesters, incest offenders, and rapists) and 40 nonsexual offenders (violent and nonviolent) were administered the “Adult Attachment Interview.” Results indicated that the majority of sexual offenders were insecure, representing a marked difference from normative samples. Although insecurity of attachment was common to all groups of offenders, there were important differences in regard to the specific type of insecurity. Most notable were the child molesters, who were significantly more likely to be Preoccupied. Rapists, violent offenders, and, to a lesser degree, incest offenders were more likely to be Dismissing. Although still most likely to be Dismissing, nonviolent offenders were comparatively more Secure.     

Sexual abuse histories of sexual offenders

A comparison of sexual abuse histories of sexual offender and nonsexual offender inmates was undertaken. Sixty-five male subjects were interviewed and given questionnaires regarding their own sexual abuse histories and their family backgrounds. Eighteen of 29 rapists (62%), 8 of 16 child molesters (50%), and 4 of 20 nonsexual offender inmates (20%) were classified as having been sexually abused, with sexual offenders being more likely to report having been abused. A history of sexual abuse appears to be an important factor in the backgrounds of sexual offenders and it was found to be associated with other aspects of a disturbed family background.     

Alcohol and Drug Abuse in Sexual and Nonsexual Violent Offenders

According to a literature review by Marshall (1996), presently available data have not clarified the proportion of sexual offenders who would meet diagnostic criteria for addictive problems. Our own literature review failed to find published studies comparing sexual offenders to nonsexual violent offenders on standardized measures of substance abuse. Our study is a preliminary investigation of the differences between sexual offenders (rapists: n = 72; child molesters: n = 34) and nonsexual violent offenders (n = 24) on measures of alcohol and drug abuse. The findings indicate that sexual offenders were more likely to abuse alcohol than were nonsexual violent offenders. Nonsexual offenders were significantly more likely to have had a history of other forms of substance abuse. The results are considered in terms of theories of alcohol's contribution to aggressive behavior and sexual aggression. Implications for assessment and treatment of sexual offenders are discussed.     

Postrelease specialization and versatility in sexual offenders referred for civil commitment

Offense specialization and versatility has been explored previously in the prior criminal records of sexual offenders. The present study expanded these findings by examining offense specialization and versatility in the postrelease offending of a sample of sexual offenders referred for civil commitment and released. Criminal versatility (not limiting one's offending to sexual crime) both before and after commitment was the most commonly observed offending pattern in the sample. Specialist offenders (those for whom sexual offenses constituted more than half of their total number of previous arrests) were more likely than versatile offenders to specialize in sexual offending on release, perhaps indicating that specialization is a stable offending tendency. When compared by referral status, recidivism records indicated that offenders who were committed for treatment were more likely than observed, noncommitted offenders to specialize in sexual offending on release. When compared by offender classification, child molesters and offenders with mixed aged victims were much more likely than rapists and incest offenders to specialize in sexual offending on release.     

Distorted attitudes and perceptions,and their relationship with self-esteem and coping in child molesters

Two studies were conducted to compare various aspects of child molesters, nonsexual offenders, and community-based nonoffenders. These studies were aimed at examining some implications of our general model of sexual offending. Study 1 compared the responses of these 3 groups on measures of self-esteem, attitudes toward women and children, and social desirability tendencies. The only observed difference was that child molesters had significantly lower self-esteem than did the other 2 groups. In Study 2, child molesters displayed more cognitive distortions about sex between adults and children than did nonsexual offenders or nonoffenders. However in this study child molesters scored in the same range as the other participants on self-esteem and the tendency to use sex as a way of coping with problems. The results are discussed in terms of the differences between the present findings and earlier studies, and their implications for future research.     

Development and preliminary validation of a paraphilic sexual fantasy questionnaire

A sexual fantasy questionnaire (SFQ) measuring paraphilic and nonparaphilic fantasies was developed. Aspects of reliability were assessed in a sample of convicted male child molesters (27 inmates and 15 outpatients) and a convenience comparison group of 87 male undergraduates. Results indicated adequate test-retest reliability (mean r=.84), acceptable percentage agreement on repeated items (90%), and adequate internal consistency (mean Cronbach alpha=.82). The convergent validity of the SFQ was supported by the finding that child molesters reported significantly more deviant fantasies involving children than comparison subjects. Consistent with previous research, child molesters reported a similar number of normal sexual fantasies.     

The Child Molester Empathy Measure: Description and Examination of Its Reliability and Validity

The aim of the two studies presented here was to produce and refine a measure of victim empathy for the assessment of child molesters. In the first study, 61 nonfamilial child molesters completed the Child Molester Empathy Measure (CMEM), a questionnaire designed specifically for this study. The measure assessed empathy in three contexts: (a) toward a child who was in a motor vehicle accident and was disfigured, (b) toward a child who had been sexually molested by an unknown assailant over a period of time, and (c) toward the offender's own victim(s). Results indicated that the measure was both internally reliable and produced stable responses over time. The results also revealed a relative deficit in empathy toward the offender's own victim(s). The goal of the second study was to replicate the data obtained in the first study and compare child molesters' responses with the responses of a group of nonoffenders. Twenty-nine child molesters and 36 community males (nonoffenders) completed the questionnaire. This study also confirmed the internal reliability and test-retest reliability of the CMEM. The discriminant validity of the measure was supported by the child molesters' demonstrated relative deficiency in empathy toward an unknown offender's victim of sexual abuse. However, the child molesters displayed equal empathy toward the accident victim relative to nonoffenders. Additionally, the child molesters displayed significantly less empathy toward their own victims than toward the general sexual abuse victim. The results are discussed in terms of their theoretical and practical implications.