Agreed - but the education should already be provided, through parents, friends and other relations. As well as any religious groups and other community groups already in place.
This obviously isn't happening a great deal, because this is where most of the health, social, personal & citizenship education should be given. I.e. don't expect schools to be effective in this type of education.
Why Not - cause quite a large proportion of the pupils that need this education have become disaffected with school (and life) by the time that they are mature enough for this type of education.