To Florus 5.5

But let us now approach the case. In both my earlier work and the present one, it has become clear that natural sexual desire, without which the union of the sexes cannot occur, was instituted by God, the creator of both human beings and animals (compare Augustine, Marriage and Desire 2.25). Even by my opponent’s admission, this is so decisive that natural sin cannot possibly be maintained without blaming that desire—bodily sexual desire—and slandering sexual union.