Drive the whole thing away like the shadow it is, and be _very_ careful not to drive it into the consciousness.

Be very careful to plant no seed of burning shame or horror.

Throw over it merely the cold water of contemptuous indifference, dismissal.
After puberty, a child may as well be told the simple and necessary facts of sex.

As things stand, the parent may as well do it.

But briefly, coldly, and with as cold a dismissal as possible.--"Look here, you're not a child any more; you know it, don't you?
You're going to be a man.