Couples Motivational Interviewing to Reduce Drug Use and HIV Risk in Vulnerable Male Couples

Inclusion Criteria: * Have a main partner who is another cisgender male and have been in a relationship for 3 month or longer * Index participant must be between 18 and 55; Main partner can be any age 18 and older * One participant must be HIV negative (as confirmed by rapid test) * One participant must have used at least 1 drug in the past 30 days (cocaine/crack, opiates, misuse of prescription medication, stimulants, psychedelics, ecstasy, ketamine, GHB, amyl nitrite) * Index participant must have engaged in TRB in the past 30 days- Defined as CAS with a casual partner, or a serodiscordant or non-monogamous main partner * Live in the United States * Speak and read English Exclusion Criteria * Any signs of serious mental illness or cognitive deficit * Current suicidal/homicidal ideations * History of IPV with their main partner and safety concerns in the current relationship.