ChrisL said,
"Regardless of your hyperbole, most do not at that age. If they do, it is usually because they don't have a very good home life, and that has nothing to do with "teaching" them, but is usually do to some type of abuse/neglect."
Most don't it's true. But because of precocious puberty (earlier than normal onset of puberty,) some do. As a result sex hormones start producing themselves and the desire for sex manifests itself. So it's not accurate or fair to say every young kid who has sex has something wrong at home or with their mentally. It's just that side of the bell curve. Some start early, most start in the middle, some start later.
Question is should we tailor school curiculums for one side of the curve? I think not. Can't be that many starting that early.