What Is Pornography?

Pornography is material, whether images, video, text or audio, made mainly to cause sexual arousal, usually by showing sexual activity or the genitals explicitly. The definition sounds simple. Ask ten people where the line falls between a nude and a pornographic image, though, and the answers start to drift. A US Supreme Court justice admitted as much in 1964, and lawmakers have been trying to do better ever since.

This piece is a map rather than a verdict. It looks at where the word came from, how its meaning changed, how lawmakers and platforms define it today, and what it is not.

Key facts

Origin of the word	Greek pornē (prostitute) + graphein (to write or draw)
First use	1769: Restif de la Bretonne, Le Pornographe, a treatise on regulating prostitution
Modern meaning	From the mid-19th century: obscene images and texts made to excite
Naples Secret Museum	Erotic finds from Pompeii locked away from 1821; fully open to the public from 2000
"I know it when I see it"	Justice Potter Stewart, Jacobellis v. Ohio (1964)
US obscenity test	Miller v. California (1973), three-part test
UK legal definition	Online Safety Act 2023, s.236: produced solely or principally for sexual arousal
UK age checks mandatory	25 July 2025, for services publishing pornographic content
EU	No single definition; the Audiovisual Media Services Directive requires protecting minors

01 · The word

Where does the word pornography come from?

The roots are ancient Greek, but the word is not. The Greeks had pornē and they had graphein, yet nobody in Athens wrote about "pornography". The word was put together in eighteenth-century France, and it meant something quite different from what it means now.

1. Antiquity
   Two Greek words Pornē, a prostitute, and graphein, to write or draw. The Greeks had both words, but never put them together in our sense.
2. 1769
   Le Pornographe Restif de la Bretonne coins the term for a writer on prostitution. His book is a proposal to regulate sex work, not an erotic text.
3. 1821
   The Secret Museum Erotic finds from Pompeii are locked away in a restricted room in Naples. Scholars need a reason, and often Latin, to get in. It does not open fully to the public until 2000.
4. Mid-1800s
   The meaning shifts The word drifts from "writing about prostitutes" to any image or text considered obscene and made to excite.
5. 1964
   "I know it when I see it" US Justice Potter Stewart admits hard-core pornography resists definition, and coins the most quoted line on the subject.
6. 2023
   A definition in statute The UK Online Safety Act defines pornographic content by its likely purpose: produced solely or principally for sexual arousal.

This is the story of the word. For the story of the images themselves, from Roman frescoes to creator platforms, read A Short History of Pornography.

Restif de la Bretonne's Le Pornographe (1769) was a reform proposal: a plan for regulating prostitution to protect the women involved and public health. "Pornographer", for him, meant a writer who studies prostitutes, the way a geographer studies the earth.

The modern meaning grew up around a problem of display. When excavations at Pompeii uncovered frescoes, sculptures and everyday objects with frank sexual imagery, the authorities in Naples did not know what to do with them. In 1821 they locked them in a restricted cabinet, open only to "mature" visitors with a respectable reason to look. The doorway was even bricked up for a time, and the collection did not open fully to the general public until 2000. The historian Walter Kendrick argued that the modern idea of pornography was born in rooms like that one: it began as a category of things that some people could see and others could not.

02 · The definition

How is pornography defined?

In 1964 the US Supreme Court heard Jacobellis v. Ohio, a case about a French film an Ohio cinema manager had been convicted for showing. Justice Potter Stewart wrote that he would not try to define hard-core pornography any further, and then added the sentence he is remembered for.

Stewart meant it as an admission, and that is why the line lasts. Pornography is one of those categories everyone recognises and nobody can quite fence in. In practice, different institutions answer the question through five different lenses.

03 · The law

What is the legal definition of pornography?

Legal systems disagree not only on where the line is, but on which line to draw in the first place.

The UK approach is worth a closer look, because it is the most explicit attempt to write the dictionary definition into law. The regulator, Ofcom, says it judges the content itself and its context. A caption calling something "art" does not change what the image shows, and one viewer finding something arousing does not make it pornography either.

04 · The test

How can you tell if something is pornographic?

Strip the definitions down and nearly all of them ask two things. How explicit is it? And what is it for? Put those on two axes and the territory sorts itself out.

The borders are blurry by design. One shoot can produce images in three of the four squares.

The top-right square is pornography. The others can contain nudity, sexuality or both, and still be something else. The boundary between "suggestive" and "pornographic" is where most arguments happen. We look at it in detail in Glamour, Boudoir, Erotic Art and Pornography, including why an open-leg pose usually crosses it even when nothing else is happening in the frame.

05 · The exceptions

Is nudity pornography?

Ofcom's guidance is useful here because it lists examples of content that shows nudity or deals with sex but is not, on its own, pornographic. Among them:

• Glamour and boudoirSuggestive imagery whose main purpose falls short of sexual arousal.
• Fine-art and documentary nudityThe body as form, or as a fact of the scene: a life study, a naturist beach, a changing room.
• Education and medicineAnatomy, sex education and clinical imagery, however explicit.
• Drama and comedyNudity or sex that serves the story or the joke rather than being the point.
• JournalismNon-sexual nudity in reporting and news imagery.

The common thread is that the body is present, sometimes completely, but arousal is not the reason the material exists. That is the distinction photographers have defended since the first nude studies, and the one social networks most often fail to make when they treat every nipple as a violation.

06 · The ideas

What have critics and scholars said about pornography?

Beyond the law, pornography has been one of the most argued-over subjects in modern criticism. Four positions are worth knowing, and they disagree sharply with one another.

For a more philosophical angle, the Italian actor and director Carmelo Bene placed the pornographic at the moment the person disappears and only the body remains. We discuss his idea in our glamour article.

07 · In practice

How does BentBox draw the line?

BentBox allows adult content, and we think the honest thing is to be precise about what that means rather than vague. We separate what anyone can see from what a buyer chooses to open.

Whichever side of the line a piece sits on, the rules underneath are the same. Every creator is identity verified, every person depicted must be a consenting adult, and sexual content must carry a release form. Card networks require this for adult content, and we would require it anyway.