Just as a quibble, and I'll apologize in advance for being in a quibbling state of mind, the "Adult" in our site's name does not mean that every story has to contain sex, graphic or otherwise, or violence. There are mature themes that don't necessary translate as sexual or violent. They're equally welcome here, and we even have a NoSex tag for those who can't live without it. We also allow original fiction as well as fan fiction, meaning I don't need to deal with publishing my work on multiple sites because I don't always write fan fiction.
We're not all here to write graphic content. Some of us just want the freedom to write our stories as they evolve, without worrying about scarring the psyches of 13 year old users, and without worrying about being plagiarized, flamed or otherwise abused. I began here as an author, and volunteered as a way to support a site that respects the dignity of authors.