Does the Organized Sexual Murderer Better Delay and Avoid Detection?

According to the organized-disorganized model, organized sexual murderers adopt specific behaviors during the commission of their crimes that contribute to avoiding police detection. 

The current study examines the effect of sexual murderers' organized behaviors on their ability to both delay and/or avoid police detection. Using a combination of negative binomial and logistic regression analyses on a sample of 350 sexual murder cases, findings showed that although both measures of delaying and avoiding detection are positively correlated, different behavioral patterns were observed. 

For instance, offenders who moved the victim's body were more likely to avoid detection but the victim's body was likely to be recovered faster. Moreover, victim characteristics have an impact on both measures; however, this effect disappears for the measure of delaying detection once the organized behaviors are introduced. Implications of the findings are discussed.

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By:  Beauregard E1, Martineau M2.

• 1Simon Fraser University, Burnaby, British Columbia, Canada ebeaureg@sfu.ca.
• 2Royal Canadian Mounted Police, Ottawa, Ontario, Canada.
• J Interpers Violence. 2016 Jan;31(1):4-25. doi: 10.1177/0886260514555129. Epub 2014 Oct 29. 

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Paraphilic Sexual Interests and Sexually Coercive Behavior: A Population-Based Twin Study

Prior research with selected clinical and forensic samples suggests associations between paraphilic sexual interests (e.g., exhibitionism and sexual sadism) and sexually coercive behavior. However, no study to date used a large, representative and genetically informative population sample to address the potential causal nature of this association. 

We used self-report data on paraphilic and sexually coercive behavior from 5990 18- to 32-year-old male and female twins from a contemporary Finnish population cohort. Logistic regression and co-twin control models were employed to examine if paraphilic behaviors were causally related to coercive behavior or if suggested links were confounded by familial (genetic or common family environment) risk factors. 

Results indicated that associations between four out of five tested paraphilic behaviors (exhibitionism, masochism, sadism, and voyeurism, respectively) and sexually coercive behavior were moderate to strong. Transvestic fetishism was not independently associated with sexual coercion. 

Comparisons of twins reporting paraphilic behavior with their paraphilic behavior-discordant twin further suggested that associations were largely independent of shared genetic and environmental confounds, consistent with a causal association. 

In conclusion, similar to previously reported predictive effects of paraphilias on sexual crime recidivism, paraphilic behavior among young adults in the general population increases sexual offending risk. Further, early identification of paraphilic interest and preventive interventions with at-risk individuals might also reduce perpetration of first-time sexual violence.

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By:  Baur E1,2, Forsman M3,4, Santtila P5, Johansson A5,6, Sandnabba K5, Långström N7,8.

• 1Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, The Netherlands.
• 2LWL-Maßregelvollzugsklinik, Herne, Germany.
• 3Swedish Prison and Probation Service, R&D Unit, PO Box 12055, 102 22, Stockholm, Sweden. mats.forsman@ki.se.
• 4Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden. mats.forsman@ki.se.
• 5Department of Psychology and Logopedics, Abo Akademi University, Turku, Finland.
• 6Department of Pharmacology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
• 7Swedish Prison and Probation Service, R&D Unit, PO Box 12055, 102 22, Stockholm, Sweden.
• 8Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden. 

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