 The investigators propose to address four specific aims through a randomized controlled trial RCT to take place over a four-year period. The investigators plan to enroll and maintain a cohort of 350 men who have sex with men MSM couples: 175 self-reported concordant HIV-negative and 175 self-reported HIV-discordant couples. Within this sample, the proposed study will examine the impact of home-testing with video-based Couples HIV Testing and Counseling CHTC intervention versus home-testing alone control on changes in: sexual risk-taking e.g., UAI, formation and adherence to explicit agreements about sex, relationship functioning for the management of HIV risk, and linkage to care for newly diagnosed HIV positives among MSM couples who live throughout the US. To assess these specific changes, couples will complete online surveys at 3 time points baseline, 3 months and 6 months. 