I have some teaching experience. I did not realize how much work I had to put in, but back to my point. Before schools even existed, sex education was passed on - successfully. In 1960, there were only 4 STDs (VD back then) of concern. Today, there are a lot more. Does Sex Ed. help? No, definitely not. Why? Because over the last 40 years, the media has portrayed sex as a no consequences game. And more recently, as just something unmarried people do. Relationships? Why bother? Just be “a dog.” The other person uses the other person like two dogs meeting in an alley. And people are taught by movies and TV - “It’s no big deal.”
It’s not rocket science and I’m sure the makers of the various kinds of contraceptives just want to keep making money.