Ideally yes, but what do you do if (like there were at my school) theres a bunch of plymouth brethren kids, you can't force them to attend sex ed and you don't just take it off the curriculum either.
"Content should be accessible to all pupils' sounds right but in effect would mean less content, everything narrowed down.
Coming from a 'minority culture' or whatever you'd call it and attending a normal state school does come with a bit of awkwardness, like at a minimum having to ask what the school dinner mush is made of, thats just how it is, doesn't mean everyone at the school has to eat kosher does it, schools aren't some perfect community separate from everything else.