Etiological Risk Factors for Sibling Incest: Data From an Anonymous Computer-Assisted Self-Interview

Retrospective data from 1,821 women and 1,064 men with one or more siblings, provided anonymously using a computer-assisted self-interview, were used to identify risk factors for sibling incest (SI); 137 were participants in SI. 

In order of decreasing predictive power, the risk factors identified by the multiple logistic regression analysis included ever having shared a bed for sleeping with a sibling, parent-child incest (PCI), family nudity, low levels of maternal affection, and ever having shared a tub bath with a sibling. 

The results were consistent with the idea that SI in many families was the cumulative result of four types of parental behaviors: 

1. Factors that lower external barriers to sexual behavior (e.g., permitting co-sleeping or co-bathing of sibling dyads), 
2. Factors that encourage nudity of children within the nuclear family and permit children to see the parent's genitals, 
3. Factors that lead to the siblings relying on one another for affection (e.g., diminished maternal affection), and 
4. Factors that eroticize young children (e.g., child sexual abuse [CSA] by a parent). 

Thirty-eight of the 137 SI participants were participants in coerced sibling incest (CSI). In order of decreasing predictive power, risk factors for CSI identified by multiple logistic regression analysis included ever having shared a bed for sleeping with a brother, PCI, witnessing parental physical fighting, and family nudity. SI was more likely to have been reported as CSI if the sibling had touched the reporting sibling's genitals, and less likely to have been reported as CSI if the siblings had shared a bed.

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By:  Griffee K1, Swindell S2, O'Keefe SL3, Stroebel SS4, Beard KW5, Kuo SY2, Stroupe W2.

• 1Concord University, Athens, WV, USA Karen.Griffee@gmail.com.
• 2West Virginia State University, Institute, WV, USA.
• 3Marshall University Graduate College, South Charleston, WV, USA Marshall University, Huntington, WV, USA.
• 4Marshall University Graduate College, South Charleston, WV, USA.
• 5Marshall University, Huntington, WV, USA. 

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Nudity as a Disinhibiting Cue in a Date Rape Analogue

Situational factors likely play a role in date rape. The sexual inhibition hypothesis suggests that men are typically sexually inhibited by violence and non-consent, but that inhibition can also be disrupted. 

We attempted to determine if female nudity reduces inhibition of sexual arousal to non-consensual cues in sexually non-aggressive men. In two studies, heterosexual men (aged 18-25) were presented with six 2-min audiotaped narratives depicting consensual sexual interactions, non-consensual sexual interactions (rape), and non-sexual interactions (neutral) involving a man and a woman. In the first study, 20 participants saw pictures depicting nude or clothed women while listening to the stories. 

In the second study, 20 other participants saw videos depicting nude or clothed women exercising, also while listening to the stories. Genital responses and subjective sexual arousal were measured. 

Results suggested that nudity may have a disinhibitory effect on sexual arousal to non-consensual cues, but only when presented in the form of moving images.

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By:  Fairweather A1, Kingston DA2, Lalumière ML3.

• 1Department of Psychology, University of Lethbridge, Lethbridge, AB, Canada.
• 2Integrated Forensic Program, Royal Ottawa Health Care Group, Brockville, ON, Canada.
• 3School of Psychology, University of Ottawa, 136 Jean-Jacques Lussier, Ottawa, ON, K1N 6N5, Canada. martin.lalumiere@uottawa.ca. 

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