Smutfic

"Giving the reader a sex scene which is only half right is like giving her half of a kitten. It is not half as cute as a whole kitten; it is a bloody, godawful mess." - "How Not To Write A Novel", by Howard Mittelmark and Sandra Newman.

Smutfic is fanfiction that focuses mainly on smut between two (and sometimes more) characters.

Bad smutfic is categorized as NSFW, or Not Safe For Work, meaning that it wouldn't be a good thing to be caught reading at work.

Really bad smutfic is categorized as NSFB, or Not Safe For Brain, meaning that brain damage and/or permanent removal of one's mind to the gutter is highly likely to occur upon reading.