My parents had bought a book on the subject to read to us kids. I got a hold of it first and read it by myself. When my dad brought me to bed, I "educated" him about where kids come from. It's still one of my parents' favorite stories about me as a kid.
In school, sex ed was alright. They taught us everything we need to know incl. how to prevent STDs and pregnancies. The only thing I would criticize in hindsight is that they used giant test tubes (25cm) to teach us how to put on condoms. That made a lot of boys feel inadequate.
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