One thing that is not considered enough in these discussions is the changing age of puberty - 200 years ago girls had their first period at 16 on average, now it’s 12. These discussions are having to take place earlier because biology has changed (although emotional maturity hasn’t ).
This is false. Children start puberty now at the exact same age as they did 2000 and 1000 years ago, between the ages of 10 and 12.
This common but false assumption that puberty keeps happening at ever younger ages derives from an artifact of data collection.
The time period when researchers started collecting data on the onset of menarche happened to coincide with a time period where standards of living were horrendously inimical to children developing normally.
In Austen's time poverty, starvation, malnutrition, hygiene and dangerous levels of land, air and water pollution led to children having such damaged health that their bodies went through puberty abnormally late.
If you look at the archaeological records of skeletons found in London from that era, one in four skeletons of 25 year olds show that they had not yet finished puberty. (Which typically lasts between two and five years, girls finish on average by 14, and boys finish on average by age 15 or 16. If living conditions allow for healthy development.)
The latest research confirms that while the onset of menarche declined drastically in the first half of the 20th century, as living conditions improved, it has been stable now for several decades. It occurs at the normal time for girls (between the ages of 12 and 13 on average).
So, no, children do not start puberty earlier and earlier and therefore there is no need whatsoever to educate children at ever younger ages about sex, sexual pleasure and sexual practices, especially not in ways that normalise the sexualisation of young children as done in this case.