This report provides an overview on the state of implementation of the comprehensive sexuality education (CSE) in sub-Saharan Africa (SSA). As case studies, it analyzes the CSE programs in Zambia and Namibia, two countries in Southern Africa that have received praise for running successful CSE programs. The report is based on a review of published and unpublished literature, including journal articles, reports, policy briefs, policy documents, and conference proceedings, and from primary data collected through interviews with key government ministries and organizations involved in CSE implementation in Zambia. In the report, we cover aspects of implementation; coordination mechanisms; funding and advocacy; and monitoring and evaluation (M&E) for CSE programs in the region, and specifically in Zambia.