Baseline Assessment. After couple confirmation, the couple will be scheduled for an in-person appointment. After consenting to participate in the study in-person (consent process described below), the 2 partners will be directed to complete a baseline assessment. This approximately 60-minute questionnaire will assess demographics, relationship characteristics, HIV knowledge and motivations, HIV risk and prevention behaviors, and other relevant psychosocial outcomes (e.g., substance use, mental health). The couple will then be given additional information about the structure of the intervention and scheduling options. The baseline assessment will occur 1 week prior to the first session of the 2GETHER intervention. Urethral/rectal STI testing will also occur at baseline.