One unfortunate result of the one child policy was that because amniocentesis made it easy to determine the sex of the fetus, female babies, not generally the choice if you could only have one child. were aborted. The result of this in the coming years, according to social anthropologists, will be a lopsided ratio of males to females, which will lead to all sorts of problems as the competition increases for who gets the girl.

In 2014 the ratio was 115.88 boys born to 100 females.

So, not exactly a sex education problem. More a situation of access to modern medical tech. But your point is well taken.