Maybe it was because the generation of fathers who had lived in sin themselves thought it was hypocritical for them to teach sexual propriety to their children. As a result their children received no moral teaching at all.
In a sort of ghastly simplicity we remove the organ and demand the function. We make men without chests and expect of them virtue and enterprise. We laugh at honour and are shocked to find traitors in our midst. We castrate and bid the geldings be fruitful. ― C.S. Lewis, The Abolition of Man