In secondary school sex-ed was during biology. (In primary school we got a short primer about puberty.)We discussed the reproductive system of plants, then animals (mammals more in depth) and then humans. It touched on pregnancy but not too in depth. The same year we had a seperate class, by our biology teacher about STI's and all kinds of ways to prevent them/pregnancy. Then in a later year we had a biology class specifically about pregnancy and development of the foetus. We also watched a documentary about thalidomide babies :/. Same teacher (but for physics) also showed us a docu about Chernobyl. Very interesting but not exactly something I wanted to see before lunch.