A new relationship and sex education (RSE) programme has been provided to Catholic Primary schools in Northern Ireland.
Flourish was approved by the Irish Bishops' Conference and has been adapted for the Northern Ireland curriculum.
It includes topics like conception, bullying, same-sex attraction and puberty - including discussion of periods and wet dreams.
However, contraception is not included.
The Catholic Schools' Trustee Service (CSTS) said that was because Flourish was "designed to encourage age appropriate conversations".
