There is a National Curriculum for Sex and Relationships Education but it is only statuatary at Key Stages 3 and 4. There is also a National Accreditation for teachers wishing to qualify to teach it. Unfortunately not all schools do as much as they could.
One of the problems is uninformed people who think that Sex and Relationships Education is all about teaching primary age children about condoms.
Another, much more worrying problem is that most young girls see sex as something that is done to them and not even something to be enjoyed.
More later.....