How many different kinds of -xploitation films are there?

[Raffine]

here's a few of the categories offered by Shocking Videos.
They offer a good outline of various exploitation genres:

American Trash
Asian Invasion
Aussie Trash
Biker Movies
Blaxploitation
British Sex Films
Celebrity Sleaze
Costumed Hijinks
Drugs & Dopers
Euro Trash
Giallos
Hicksploitation
Horror & Gore
Italian Crime
Martial Arts
Mexi-Madness
Mondo Macabro
Nazi Nasties
Nunsploitation
Peplumania
Sex Reports
Spaghetti Westerns
Teensploitation
Women in Prison

[zombie no.one]

Dogsploitation (Lassie, K9, Turner & Hooch, Cujo, Beethoven, Homeward Bound etc, etc...)

[Pennywise]

Christsploitation is when people make preachy Christian films. I've seen that term in some magazines.