It is a different story when incest occurs and a High school graduation candidates or just before that student whines at their mother and the mother uses her body for sex education.
I suspect that these people have lost their sense of reality by watching too much porn.
In reality, in most cases, except for cases where there is a physical or mental problem, one side reveals a desire and the other side accepts the desire.
Including coercive crimes.
Also, while I have brought evidence to this forum that incest does happen in real life, but it is a special situation in only 1% of the population, and penetrative sex is even less so.
I once interviewed them out of curiosity.
It's true that they keep secrets, but they don't use sex education courses to develop relationships.
They start out the way normal lovers start.