This document discusses the advantages of meaningful community involvement in monitoring and evaluation (M&E) of HIV prevention programs. It notes that community members are often relegated to peripheral advisory roles rather than active contributors. However, involving the community results in more precise questions, stronger validity of interventions and measures, and a focus on feasibility and sustainability. A case study of a global online survey of men who have sex with men found that factors like connection to community and comfort with providers influenced HIV testing and PrEP access. The implications are that tailoring approaches to different sub-groups and ensuring enabling prevention environments will help scale up PrEP and treatment.