Adult fiction is a genre of literature that is intended for mature audiences, typically those over the age of 18. This genre includes a wide range of sub-genres, such as romance, historical fiction, science fiction, and crime fiction, among others. Adult fiction often explores complex themes and features realistic characters facing difficult choices, making it a popular genre for readers who want to engage with thought-provoking and challenging stories.

One of the key characteristics of adult fiction is its focus on adult themes and issues. Unlike young adult fiction, which typically explores the experiences of teenagers and young adults, adult fiction often delves into more mature subject matter such as sexuality, violence, and substance abuse. This can make adult fiction more challenging to read, but it also allows authors to explore complex topics in a nuanced and thought-provoking way.

One of the most popular sub-genres of adult fiction is romance. Romance novels often explore themes of love, passion, and intimacy, and are typically written with a female audience in mind. However, there are also many romance novels that are written for a male audience, and that explore the experiences of men in romantic relationships. Romance novels can be set in any time period or setting, and often feature complex and well-developed characters who are struggling with issues such as betrayal, trust, and loyalty.