It has become more diverse. In the past, it might have been more focused on simple, straightforward sexual encounters. Now, it often includes more complex characters and storylines. For example, it may incorporate elements of romance and psychological exploration.
Eroctic fiction has changed a great deal over the years. In the early days, it was more likely to be published secretly or in underground channels. Now, it has a more visible presence, although still somewhat controversial. The evolution also includes the way it deals with gender roles. In the past, it may have been more stereotypical in its portrayal of male and female characters in sexual situations. Nowadays, it's more likely to break those traditional gender norms and explore more fluid sexual identities. The language used has also become more sophisticated, and the overall quality of writing has improved in many cases as more skilled authors enter the genre.