['Perceived partner concurrency, reporting that a current sexual partner has other sexual partners, may pose sexual health risks to adolescents. We examined the contextual characteristics of African American female adolescents who reported their current boyfriend was having concurrent sexual relationships.', 'Participants were African American adolescent females (N = 511; mean age = 17.6) recruited from sexual health clinics. Before participating in an STD/HIV prevention trial, the participants completed audio computer-assisted self-interviews with measures of perceived partner concurrency and individual- (e.g., depression, substance use), interpersonal- (e.g., social support, interpersonal stress), and community-level factors (i.e., neighborhood quality).', 'Twenty-seven percent of participants reported their belief that their current boyfriend had concurrent sexual partners during their relationship. In a logistic regression analysis, participants endorsing perceived partner concurrency reported less relational power (adjusted odds ratio [AOR] = .94, 95% confidence interval [CI] = .89-.98, p < .01), decreased relationship commitment (AOR = .88, 95% CI = .80-.96, p < .01), elevated perceived interpersonal stress (AOR = 1.02, 95% CI = 1.003-1.04, p < .05), and previous STD diagnoses (AOR = 2.07, 95% CI = 1.31-3.28, p < .01; overall model: χ(2) = 67.25; p < .001).'] Do characteristics of African American adolescent females who perceive their current boyfriends have concurrent sexual partners?