Well, that is a load of crap. That is the education I got 40 years ago - and I am still not a parent.
I was not taught to be a “grownup in training” by pointing at the examples of grownups still behaving as children for my models. My dad was my model, he was married to one woman his entire life - and only fathered children with her. All of my grandparents, uncles, and my aunts were similar models for me.
That proper education should be provided by the parents, or their APPOINTED surrogate teacher, not assumed by some know-it-all tramp who has no idea what discipline or what controlling one’s desires is about.
Anyone who does not teach about sex properly is doing great damage to families, to communities and to society. If the first thing they teach is not, “Sex is extremely powerful, extremely dangerous, and extremely harmful outside of a true, devoted marriage.” Then they know NOTHING about sex, and have no business teaching anyone else about it.
Telling your kid “Just don’t do it!” sounds like a wonderful idea - until your kid gets knocked up or infected. This isn’t the world you grew up in and teens are always doing things their parents don’t know about.