For the reasons just stated, I consider that by the means I have indicated and others like them the young… — Jean Jacques Rousseau

For the reasons just stated, I consider that by the means I have indicated and others like them the young man's desires may be kept in ignorance and his senses pure up to the age of twenty. This is so true that among the Germans a young man who lost his virginity before that age was considered dishonoured; and the writers justly attribute the vigour of constitution and the number of children among the Germans to the continence of these nations during youth.

This period may be prolonged still further, and a few centuries ago nothing was more common even in France. Among other well-known examples, Montaigne's father, a man no less scrupulously truthful than strong and healthy, swore that his was a virgin marriage at three and thirty, and he had served for a long time in the Italian wars. We may see in the writings of his son what strength and spirit were shown by the father when he was over sixty.

Source: Wikiquote · CC BY-SA 4.0