Journal of Interpersonal Violence, Ahead of Print.
Bisexual women experience higher rates of rape and post-traumatic stress disorder (PTSD) prevalence compared to heterosexual and lesbian women. In addition, bisexual women experience unique antibisexual stigma and minority stress, which are associated with post-trauma outcomes. The aim of the current study was to test trauma-related shame as a mechanism in the relations of self-blame and bisexual minority stress (i.e., antibisexual stigma and internalized binegativity) with rape-related PTSD symptom. The sample consisted of 192 cisgender bisexual women (ages 18–35 years) who reported an experience of rape since the age of 18. Results from path analysis conducted in Mplus indicated that trauma-related shame mediated the link between self-blame and rape-related PTSD severity, as well as the links from antibisexual stigma and internalized binegativity to rape-related PTSD severity. There was also an indirect serial effect from antibisexual stigma to internalized binegativity to shame to PTSD severity. Thus, findings highlight the mechanistic role of trauma-related shame in rape-related PTSD symptoms. We identified two risk pathways: (a) general/universal risk from self-blame about rape and shame to PTSD severity and (b) group-specific risk from bisexual minority stress and shame to PTSD severity. Results indicate that reducing trauma-related shame may be an important target to improve post-rape outcomes. Finally, stigma associated with rape and sexual violence as well as antibisexual stigma must be eradicated to improve post-trauma outcomes among bisexual survivors.