Arousal to amputees
Arousal to caverns, crevices, and valleys
Arousal to objects that have been in physical contact with desired person
Arousal to sex in front of mirrors
Arousal to stone and gravel
Arousal to fog
Arousal to a body part other than the reproductive organs, e.g., noses
Arousal to feet
Arousal to buttocks
Arousal to wood
Well...if any of these turned you on, you might have a hidden fetish you didn't know about.
From Acrotomophilia to Xylophilia, there are some strange things that turn people on.