These conference proceedings present a review of the changes in sex and relationships education (SRE) in England since the conception of the Sex Education Forum (SEF) in 1986. It gives an overview develpoments, discusses the current policy context and sets out a vision for the future. The papers presented at the 21st Birthday conference cover a broad range of SRE issues, including: a history of SRE campaigning; what works - international evidence; characteristics of effective SRE; a normative approach to SRE; young people and pornography; exploring SRE in a multi-faith society; building bridges between parents and schools; involving young people in SRE; and working creatively with vulnerable young people. This book charts the history of SEF in campaigning for statutory SRE and is essential reading for anyone interested in the development of SRE in schools and the advancement of SRE policy internationally.