Fetish Fuel is a fan term used as a label for any element of a story that serves to titillate the reader's erotic or obsessional sensibilities. The term is not limited strictly to what your dictionary would define as a fetish, but it excludes Explicit Content. It stands in pretty well for the word 'fixation', actually. Both of these sentences mean the same thing:
- "He has a Light Saber fixation."
- "Light Sabers are his fetish fuel."