"Pamela Connolly (2006) compared BDSM practitioners to published norms on 10 psychological disorders. Compared to the normative samples, BDSM practitioners had lower levels of depression, anxiety, post-traumatic stress disorder (PTSD), psychological sadism, psychological masochism, borderline pathology, and paranoia. (They showed equal levels of obsessive-compulsive disorder and higher levels of dissociation and narcissism.) Similarly, Andreas Wismeijer and Marcel van Assen (2013) compared BDSM practitioners to non-BDSM-practitioners on major personality traits. Their results showed that in comparison to non-practitioners, BDSM practitioners exhibited higher levels of extraversion, conscientiousness, openness to experience, and subjective well-being. Practitioners also showed lower levels of neuroticism and rejection sensitivity. The one negative trait that emerged? BDSM practitioners showed lower levels of agreeableness than non-practitioners."