From a Christianity Today article on the topic. “So, what does the Bible say about porn? From a very technical standpoint, the word pornography does not appear in the Bible. The word pornography is a construction from the two roots porneia and graphe.

The Greek root word, porniea, however, appears many times in the New Testament. This term is often translated in English as whoredom, fornication, adultery, or sexual immorality. You might say that porneia is a “catch-all” word for any type of filth or perversion….. Over and over, the Bible makes it clear that we are to avoid sexual immorality because it has a lasting residual effect. The images stay in our minds, it creates soul ties, it changes how we view sex, how we treat women, and it rewires our brains.” (Emphasis mine) Link.