I started getting sex ed lessons in year 10 so I would've been about 15, also we stopped having sex ed lessons about 1 month after they started.
This is how they went, our first teacher was to embarrased to even mention the word penis or vagina so it was all like "When a man inserts himself into a women" etc. Obviously there was some genuine idiots in the class so they asked "Where?" after 2 lessons she left.
Then we had a supply for the next lesson who came in and didn't even know what he was teaching us so he said "If you've got something else to do go do that if not you can stay here" I stayed there and he told us a story of his first time.
"Well me and my girlfriend decided we would go out one night and have a foursome, there was me, her, my best friend and his girlfriend." We all burst out laughing as we did not expect him to have a foursome, he did not know what we were laughing at and then explained it was a double date. "My best friend and his girlfriend went home and no doubt they had sex as he was braging to me the next day, but me and my girlfriend waited until we were married and when you have sex with someone you genuinly love it is amazing."
Thats about all I was taught in sex ed so they were pretty crap.