The term "adult literatures" refers to a broad range of written material intended for mature readers. However, this definition is often too vague and can refer to many different literary genres or styles. There are several synonyms for this term that can help to narrow down the specific type of literature being referred to. These include erotic literature, literary erotica, erotica fiction, steamy romance novels, mature literature, and mature-themed literature. Each of these synonyms has its own connotations and nuances, and it's important to use the right one depending on the context and intended audience. Ultimately, the key to finding the right synonym for adult literatures is to understand what kind of literature is being discussed and which aspect of it is the most important.