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My DCs school have a policy document on "Education for Personal Relationships" on their website which outlines what is taught. We are always sent letters and invited to view materials before things are covered in school.
If you are unsure what will be covered PureQuintessence you could always ask the school.
This differs from School to School, in the local boys RC school they cover the very limited basics, however in the girls RC school they cover everything including contraception, termination and sexuality. I know this as I was one of the team who worked with the church to set up one of the best sex ed programs in the area.