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The current study sought to identify types of group sex acts among HIV-negative men who have sex with men MSM and assess their association with different sexual risk behaviors using cross-sectional data of group sex acts reported during 6 waves — of the Amsterdam MSM Cohort Study. Latent class analysis was performed to identify group sex types based on size, familiarity with partners, location, planning, and drug use. Associations between group sex types and sexual behaviors were evaluated using logistic regression with generalized estimating equations, employing the sample mean as a reference.