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The objectives of this study were as follows: (1) to determine the extent of agreement between adolescents’ perceptions of sex-partner concurrency (having a partner who has other overlapping sexual partnerships) and their partners’ self-reported concurrency, and (2) to identify the relationship-level factors associated with agreement.

Adolescents ages 14 to 19 years, along with their main sex partners, were recruited from a primary care clinic and a public sexually transmitted disease clinic and interviewed separately about their own concurrency status and their perception of their partner’s concurrency status. Information from both participants and their partners were included in this analysis (N = 90 couples).

This sample consisted of African-American, sexually experienced heterosexual couples. For males and females who perceived their partner not to have other partners, 16 …