Before the child ever gets to school it will have received crucial, almost irrevocable sex education and this will have been taught by the parents, who are not aware of what they are doing.
When there are multiple versions of a story, you really have three ways to go. You can pick the most sensational version. You can try to balance things in your gut to get to what you think is the honest truth. Or you can err on the side of kindness.
In every religion there is an element of the supernatural, varying with the influence of pure reason over its devotees.