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The impetus for developing an inventory that assesses sexual and aggressive thoughts, fantasies, and behaviors evolved from programmatic work on the classification of sexual offenders. To classify rapists in the Massachusetts Treatment Center Rapist Typology, Version 3, detailed information on several dimensions is required, including social competence, expressive aggression, sadism, juvenile and adult general aggression and antisocial behavior, undifferentiated anger, offense planning, and various aspects of sexual behavior and deviance. To supplement the often poorly represented information in archival records and to provide an assessment tool to gather sufficient data to categorize offenders, the Multidimensional Assessment of Sex and Aggression (MASA) was created. The MASA was administered to 127 sexual offenders, and after a 6-month interval a subsample of 35 offenders repeated the inventory. The preliminary reliability and validity data that are presented support the usefulness of the MASA for assessing the domains necessary for classification.

The Multidimensional Assessment of Sex and Aggression (the MASA) was initially created to supplement the often poorly represented information in the archival records of sex offenders and to provide sufficient data to classify adult sex offenders. It has now been revised four times, expanding the breadth of its assessment, simplifying its language to make it appropriate for juveniles, and computerizing its administration. This article summarizes some of the recent reliability and validity analyses that have been calculated on a wide variety of samples including college students, community noncriminals, non-sex offending criminals, and adult and juvenile sex offenders. Continued reliability and cross-sample stability of factor structures and the intercorrelations across I its scales suggest that the inventory shows promise as a useful assessment instrument for sex offenders.

This study examined the utility of lifestyle impulsivity as a typological discriminator for recidivism among rapists. Impulsivity was examined with respect to four criminal offense domains on a sample of 109 offenders discharged from a maximum-security treatment facility over a period of 25 years. In all instances, the hazard rate for the high-impulsivity group was at least twice as great as the hazard rate for the low-impulsivity group. For nonsexual, victimless charges, the hazard rate was almost four times as great.