But simply, there is no indication in the Bible anywhere that teaching a child about sex is immoral.There is a common sense teaching however, that even though some things are not said to be wrong, that that doesn’t mean they should be done.
Many true Christians when reading what I just said will no doubt to me recall this verse: “Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter!
That’s another indication that had the ability to learn without having to be told everything.
2) If God commanded them to do something, like “be fruitful and multiple” why wouldn’t it be common sense to think they would have asked them, like any curious child (and the Mormons did insist that they were “just children”), that they would ask God what he meant, and like a good and intelligent father, would tell them?
4) There’s no evidence that it’s immoral to teach a child about sex like was implied by the Mormons I met.
For example, if in a culture where children are allowed to marry at 8 or 12 (Afghanistan and Spain), it wouldn’t be unwise to tell them what to expect.