What is smut book?

As an AI language model, I can provide you with the definition and some general information about a "smut book."

A smut book, also known as Erotic literature or erotica, is a genre of literature that contains explicit sexual content, often featuring taboo subjects or unconventional relationships. Smut books can be found in the form of novels, short stories, poetry, and even comic books.

While literary works containing sexual content have existed throughout history, the modern smut book emerged during the sexual revolution of the mid-20th century. The genre has since expanded to encompass a wide range of subgenres, including BDSM, LGBTQ, and paranormal.

Smut books can be controversial and have been subject to censorship and legal challenges in different countries. However, they have also gained a widespread following and have become a significant segment of the publishing industry.

It's essential to note that literature and art serve different purposes and are subject to different interpretations and perspectives. Therefore it is a matter of personal taste and preference to choose whether to read smut books or not.