To Florus 5.18

This is what we understood. Speaking about nature’s institution, we brought forward what the apostle plainly meant. What, then, did you accomplish by replying that he calls it natural rather than marital use? Or with what mouth do you add: ‘When someone unites with a prostitute using the same organs, it is natural use, yet not praiseworthy but blameworthy’? Let us show here too what we have often disclosed: you utter not even one sentence that does not count strongly against you. If the use involved in fornication is called natural, yet not praiseworthy but blameworthy because it is intercourse with a prostitute, you will undoubtedly confess marital intercourse, because it is honorable and lawful, to be not blameworthy but praiseworthy (compare Romans 1:27).