Wiktionary
kleptolagnia
n. A paraphilia in which sexual arousal is engendered by theft.
Wikipedia
Kleptolagnia
Kleptolagnia (from Greek kleptein meaning "to steal", and lagnia meaning "sexual excitement") is the state of being sexually aroused by theft. A kleptolagniac is a person aroused by the act of theft. A sexual form of kleptomania.