Non-monosexual Partnerships: Information, Motivation and Self-Efficacy among Methamphetamine-Using Men Who Have Sex with Men Who Also Have Sex with Women or Transgender Persons.

Objectives: Sex with more than one gender is associated with higher substance use, and sexual HIV risk.

Methods: We examined knowledge, motivation, and self-efficacy to engage in safer substance use and sexual behavior among methamphetamine-using U.S.