Name for a prestige class just popped into my head.

[Cheiromancer]

Don't forget those folks who read palms! I.e. tell the future by looking at someone's hand.

 

[Chris Tavares]

Sounds like a fit for Unknown Armies...

The Unknown Armies game (non-d20, sorry) has lots of nifty magic traditions - kleptomancy would fit right in with dipsomancy, epideromancy, and pornomancy.

 

[Krug]

Yes, the comic book The Filth has a Pornomancer as well.. better suited for d20 Modern or d20 Future perhaps.