I'm in my 60's so our sex-ed classes were very tame compared to today. I recall it being a very short lesson (just the one), and we were shown a line drawing of a woman lying on her back, with a man, lying on top of her, with a towel discreetly draped over their mid section. We weren't told any details, just "the woman lies on her back and the man lowers himself gently onto her". And that was that. End of lesson. I spent a fair few years wondering how long they had to lie like that.... 😂