Foster youth evidence shows elevated rates of risk behaviors, including sexual risk‐taking (e.g., unprotected sex). Some studies have identified child maltreatment, particularly sexual abuse, as a risk for later sexual risk‐taking, but none have examined how child welfare placement experiences relate to youth's sexual risk‐taking. This study investigated relations among child maltreatment, child welfare placements, and sexual risk‐taking among 114 recently emancipated female foster youth. Sexual abuse and failed reunifications with parents were associated with greater sexual risk‐taking. Moreover, dissociative symptoms exacerbated the relation between sexual abuse and sexual risk‐taking. These findings highlight the need for greater consideration of risks associated with emancipated youth's sexual risk‐taking and for more research to understand how youth experience unsuccessful family reunifications.