“There seem to be important differences between the teaching of sex education and the teaching of other subjects in this respect though.
My mum was a teacher and for her subject (languages) the school owned a set of text books which were loaned out to each student at the start of the year. The text books were usually a bit dated (I remember using the old Arc en Ciel French books in the late 1990s and early 2000s for example), but since French grammar and vocabulary hadn't changed particularly radically, schools could get away with using the same set of text books for a couple of decades before they really needed replacing.”
The other thing that hasn’t changed particularly radically (or indeed at all) is the mechanics of sexual reproduction. So why don’t schools have existing teaching and learning materials which they can use to teach sex ed?
OK, I get that the wider context of growing up in an online world is a massive difference - and especially the availability of videos of extreme sexual violence against women and girls which children are able to access on their phones - and the culture of sexting, nudes and digital harassment of girls.
But it seems to me that an external provider whose main focus is on protecting children from these online harms would be unlikely to be an external provider which also refuses to let parents have a copy of what it is teaching their children.