For those who want to write
Erotic Books, there are many thousands available online in electronic format. When it comes to writing, adult fiction is a pretty competitive niche, given the great amount of interest anything related to sexuality attracts in the online world. However, this doesn't mean that success is impossible for new authors. You will just need to be creative and take these steps:
Think of your sub-genre
In adult oriented literature, there are several hundred sub genres of erotic books. Books can be classified by the type of sexuality that they portray: gay or lesbian stories, domination, bondage, group sex, etc. Another classification is the context in which the action takes place. This can be in time (modern times, the future, during the Roman Empire, during the Renaissance period...) or in different regions of the globe.
Consider creating a series as opposed to just a one off book
You can find plenty of romance books that are just one story which has a beginning and a conclusion. While this is not necessarily bad, some of the most successful authors of erotic books sold online have written series that have either recurring characters or a recurring theme (such as time period, location, activities performed by characters etc.) You can even combine several recurring elements into a series of erotic books, such as the stories of one character who travels around the world and meets different secondary characters.
A good title and cover art will help a lot
One thing that will make your book stand out from all the others in your sub genre is its title, as well as the attractiveness of the cover. Many self published authors don't give too much thought to their title or the artwork on the cover, which is where you have an opportunity to truly distinguish yourself. You can hire a graphic designer to help you put together the cover art for your eBook if you don't want to create it yourself.
Sell your book through an eBook marketplace
While it is possible to sell your book on your own website, if you don't have any traffic going to it at the moment, this could be quite difficult. This is why selling your new book through an online marketplace such as the Amazon Kindle Store is a much better way to do things. You will have access to interested buyers right away. All you need to do is to upload your book to the service and set the price at which you will be selling it to your readers. The traffic is already there.