Subsequent to the introduction of compulsory relationships and health education in primary schools and relationships and sex education and health education (RSHE) in secondary schools in England from 2020, this paper examines the attitudes of parents towards school- and home-based RSHE. Using data from a survey of parents (n = 849) of children at 37 independent schools in England and Wales, we analysed parental attitudes towards school-parent communication about RSHE, the teaching of RSHE in school, and their own communication with their children about relationships and sex at home, exploring perceived barriers and use of resources. We found significant parental support for school-based RSHE, alongside some concerns, as well as uncertainty and embarrassment as barriers to parent-child communication about relationships and sex at home, indicating the need for schools to strengthen school-parent partnership in this area, and to encourage parents to talk to their children at home in tandem with what is being taught in school.