In this study, we conduct a cross-sectional study investigating the prevalence of hypogonadism in HIV-infected MSM population. Age-matched non-HIV infected MSM group will be used as comparison group. We will also determine the risk factors associated with male hypogonadism (age, duration of HIV infection, comorbidities, BMI, ART use). Correlation will be made between serum testosterone levels and sexual function, vitality, exercise capacity, mood, and bone mineral density.