The concept of a 'sex worker novel' as a new genre is a bit of a misnomer. While there are novels that deal with sex work, it has always been more of a sub - theme within broader literary categories like social realism or historical fiction. It has not emerged as a new, distinct genre in the way that, say, science fiction or detective novels have. It is still more of an aspect of other types of literature.
It's not a new genre. However, in recent years, there may be more attempts to explore the topic in a more in - depth and perhaps more empathetic way, but still, it doesn't form a fully - fledged, widely - accepted new genre. There are ethical and moral considerations that often make it a complex area to be just a stand - alone genre. Writers usually incorporate the theme into broader social or character - based stories.