The most useful shit I learned about sex, I learned from my mum. Namely, my most absolute, unbreakable, set-in-stone rule when it comes to sex: make sure you can't get your partner pregnant until you know you're DAMN ready to have kids (if you want them at all, which I do not), and ensure that, should you have the misfortune of obtaining a STD, you should take every reasonable measure to ensure that its not spread to your partner.
The shit I got from school was mostly abstinence-only bullshit, aside from my 9th grade health class, which actually gave real, honest stats on the efficacy of various methods of contraception.
<off topic>You got factual sex ed freshman year? I got two bullshit filled "if you have sex with anyone except your G-dly husband you'll be ruined as a human being" days as part of a larger (and even stupider) 11th grade Health class. The teacher brought in his personal friend, who "just so happened" to be a youth pastor, to say anything even remotely icky. I even got the "tape" illustration that compares people who have (dun dun DAAAHHH) extramarital sex to useless pieces of garbage. No one even mentioned any form of contraception, except to spout bullshit about how "it won't protect your heart!" So yeah, I'm way jelly. </off topic>
Surprisingly, all we got was a piece of paper that we had to sign saying that we wouldn't have sex until marriage.
It's
scary how abysmal sex-ed classes in all you guys' schools were. Sex-ed for me started in grade 5 and was repeated every year until grade 11 (when health-class became optional and I chose not to take it anymore). We learned about reproductive anatomy and how everything worked. Regarding protection the teachers basically started out with something along the lines of "Abstinence is the most effective way of avoiding STDs/pregnancy, but we know you're gonna screw around anyway, so here's how to do it safely," before describing, in significant detail, the most common STDs and a lot of contraception measures to avoid catching them. We were taught this every year for six years, grades 5 - 10, and religious bullshit was not once brought up by any of the teachers.
Around grades 9 and 10, I started thinking "Oh hell, not this again, I learned all this shit last year" when sex-ed started, but after hearing how craptacular or, in some cases, just plain non-existent, sex-ed is south of the border, I began appreciating our curriculum and what it taught me a hell of a lot more than I used to.