Pornography refers to a broad range of media depicting sexually explicit subjects with the aim of arousal.

In 2255 in an alternate reality, when James T. Kirk was being investigated for irregular computer activity, Leonard McCoy briefly worried that Kirk might have been searching for pornography. (TOS - Starfleet Academy novel: The Gemini Agent)

Some time prior to 2370 Nog traded some Eeiauoan pornography with a cat burglar in exchange for a crystal-like lock opening device. (DS9 novel: Devil in the Sky)