Among the books singled out in the report is How Did I Begin? by Mick Manning and Brita Granstrom which has a cartoon image of a couple in bed in an intimate embrace.

It is accompanied by an explanation – using frank and adult terminology – of the act of intercourse.

Another, called The Primary School Sex And Relationships Education Pack by HIT UK, includes material to allow children aged five to 11 to learn about different sexual positions and prostitution.