The relationship between borderline personality disorder and number of sexual partners.

In this study, we examined the number of self-reported lifetime sexual partners between those with and without borderline personality disorder (BPD). Our hypothesis was that, due to the nature of the disorder, those with BPD would exhibit a greater number of lifetime sexual partners. Using a survey methodology in a consecutive sample of internal medicine outpatients (N = 354), we administered two self-report measures for BPD (the borderline personality scale of the Personality Diagnostic Questionnaire-4 and the Self-Harm Inventory), and queried participants, "How many sexual partners have you had in your lifetime?" Correlation coefficients and one-way ANOVAs were conducted to determine the relationship between BPD and the number of sexual partners. According to BPD status with the borderline personality scale of the Personality Diagnostic Questionnaire-4, we found that the mean number of sexual partners among BPD-positive participants was nearly double (p < .001) that of BPD-negative participants; according to BPD status with the Self-Harm Inventory, the mean number of sexual partners among BPD-positive participants was more than double (p < .001) that of BPD-negative participants. Compared to internal medicine outpatients without BPD, those with BPD exhibit a statistically significantly greater number of sexual partners.