Just read \link{http://news.bbc.co.uk/1/hi/england/southern_counties/4850908.stm\this}
Personally, I think the school is being responsible if they are providing the girls with information in the context of their religious beliefs. IMO, it is better that they learn about such matters from a responsible source if they are not going to learn about it in their home environment. On this matter, ignorance is definitely not bliss, particularly for those girls who are vulnerable to predatory male acquaintances.