Requires every public school to provide comprehensive sexual health education (CSHE) to each student by the 2022-23 school year. Defines "comprehensive sexual health education" and establishes differentiated instructional requirements for students in kindergarten through grade 3, and students in grades 4 through 12. Establishes requirements for frequency of instruction through four different grade-level groupings. Establishes new reporting duties for public schools and the Office of the Superintendent of Public Instruction (OSPI). Establishes new technical support duties for the OSPI. Requires public schools to ensure that the CSHE curriculum, instruction, and materials include information about affirmative consent and bystander training.