Far too common is the error of those who with dangerous assurance and under an ugly term propagate a so-called sex education, falsely imagining they can forearm youth against the dangers of sensuality by means purely natural, such as a foolhardy initiation and precautionary instruction for all indiscriminately, even in public; and worse still, by exposing them at an early age to the occasions in order to accustom them, so it is argued, and as it were to harden them against such dangers.