"Because of its divine institution for the propagation of man, the seed is not to be vainky ejaculated, nor is it to be damaged, nor is it to be wasted. To have coitus other than to procreate children is to do injury to nature."(Clement of Alexandria. The Instruction of Children)
(c. 150 – c. 215), known as was a Christian theologian who taught at the Catechetical School of Alexandria.