Oh cripes. I remember my RESH (religious education and sexual health) lessons. They were awkward. They made us watch a show once with people showing their bits and pieces. Ewww! I hated them but they were compulsory. I was excused from RE lessons throughout my whole school life but RESH was compulsory.
Back in the day, it was just about the birds and the bees and infections and diseases but now it is completely different. They teach young children that it's OK to sleep around if you take precaution and that you can also sleep with people of the same sex and have relationships with them. I guess that's OK for some and not for others, but to each their own. I am not judging and I have no issue with people sleeping with the same sex or whoever. That's between them and their God.
Finally, they have also started telling young children that God CAN get things right and he sometimes puts girls in boys bodies and vice versa. Just read in a UK newspaper that they are now scrapping uniforms in one particular school so boys / girls who think they are trapped in the wrong body can feel free and not be forced to wear something they don't agree with.