I write fanfiction and original fiction for adults. Most of my stories include sexual themes, are often explicit (UK rating 18, US NC-17), and may involve heterosexual and/or homosexual (yaoi, yuri) pairings or groups. There is also occasional violence and a lot of swearing. And my odd English sense of humour...
There are also links to other sites of a similar nature.
So now you know what you're getting into, eh? If it doesn't sound like your cup of tea, or if you're too young at the moment for this kind of thing, just hit the ol' back button :)