Background-Sexual function and satisfaction are understudied aspects of adolescent and young adult sexual wellbeing, and even less is known about sexual minority youth who are vulnerable to unique LGBT-related stigma. Aim-We aimed to describe sexual functioning (sexual interest, erectile function, orgasm satisfaction, global satisfaction with one's sex life, and anal discomfort) and examine its associations with demographics, sexual and relationship behavior, and minority stressors (internalized stigma, victimization, microaggressions, and perceived LGBT acceptance within residential neighborhood) among a cohort of young men who have sex with men (YMSM) aged 16-29. Methods-Data for this cross-sectional analysis came from of an ongoing longitudinal study of HIV and substance use among YMSM (analytic N=678). We conducted univariate and bivariate analyses as well as multivariable linear regression, controlling for age, race/ethnicity, and sexual orientation as well as sexual and relationship characteristics that were significant at the bivariate level. Outcomes-We assessed sexual functioning in the past 30 days using the Patient-Reported Outcomes Measurement Information System (PROMIS) Sexual Function and Satisfaction Measures Brief Profile for Males. Results-YMSM in our sample reported high levels of sexual functioning that were significantly greater than an adult clinical reference population. However, 13.9% of the sample reported having any difficulty with erections, 6.9% reported having less than "good" satisfaction with orgasms, 20.0% reported being "somewhat" or less satisfied with their sex lives, and 9.1% reported *