There is no mandated curriculum in primary school in Denmark.
There is a set of goals for each subject taught. After finishing 9th grade there is a common test for everyone, not an exam since you cannot fail 9th grade.
The teacher and the school itself has a lot of leeway in determining curriculum, and sex ed is one the areas where there is little standardisation.
Some years ago there was an uproar when a teacher used a porn magazine in her sex ed classes.
Some moves are being made to introduce standardised sex ed material that the teachers can use, which is lacking today, where even the seminars usually do not teach sex ed to the people who are educating themselves to become teachers.