Through a grant from the National Institutes of Health, the investigators completed formative research with young male couples. Qualitative interviews identified preferences for couples-based intervention format and content. While coupled YMSM expressed some interest in HIV prevention, participants were most interested in building relationship skills. Coupled YMSM preferred group-based interventions in order to meet and learn from other couples but had concerns about discussing personal topics in groups. Quantitative analyses found that the rate of condomless sex in couples increased from adolescence to young adulthood. Further, the influence of older partners, partner violence, and drinking before sex were strongest in emerging adulthood. Informed by these, the research team developed 2GETHER, which aims to reduce HIV transmission risk in couples by enhancing relationship functioning. 2GETHER is a four session program. The first two sessions are group sessions aimed at skills building, and the second two sessions are individualized couple sessions aimed at skills implementation. Modules address communication skills, coping with stress (both general and sexual minority-specific stress), relationship sexual satisfaction, and HIV transmission risk within the dyad and with outside partners. 2GETHER was designed to address HIV transmission risk in couples regardless of HIV status; couples learn to use behavioral and biomedical approaches to prevent both HIV acquisition (e.g., HIV testing, condom use, pre-exposure prophylaxis) and transmission (e.g., medication adherence to reduce viral load), with an overarching emphasis on the health of the couple.