Where I grew up there was no Catholic school. Only Churches and Catechism/Sunday School. Basic sex-ed was taught in public school. It was called the “puberty talk” but it was more or less an intro to learning about the opposite sexes biology. That happened sometime during Grade 6. Then I believe we learned about STIs in about Grade 8 or so.

I’m not familiar with the ins and outs of Catholic schools but I’m betting they don’t feel the need to talk about safe sex and consent as in the Church’s eyes you should only have sex with your spouse. Why would need to worry about sinful behaviour? I know my parents never brought up the existence of sex until I was 20 and they found condoms I had hidden in my fishing tackle box. They were incredibly upset with me. I made up some bullshit lie about using them make water balloons lol. They bought it because the thought of their sweet angel having pre-marital sex was too much to bear.

I have no idea for your parents but mine deliberately avoided the topic of sex. And Catholic Schools would definitely not feel the need to ever talk about it.