Turn offs:
Homeless (its wrong to take advantage of someones plight)
Bland landscapes
Long exposure docks/pylons/etc in the water
Centered everything (esp in combination with long exposure docks)
Snapshit Street
Long exposure light writing
Strict adherence to rules
Anything wedding photography

Turn ons:
Well composed/Timed Street
Long tonal ranges
Exciting architecture
Panning
Panoramas
Tasteful nudes
Effective use of shadows and or negative space
Good toning with selenium, sepia, or alternatives (wine, coffee, tea)

theres probably more for both, but thats just off the top of my head