concupiscence

Pronounciation: kän-ˈkyü-pə-sən(t)s (listen to it on m-w.com)

Noun: strong desire, esp. sexual desire. (see definition at m-w.com)

Etymology: 14th century, from the latin: com (together; with) + cupere (wish/long for; desire/want/covet)

Here's a great quote from Wolf Hall: A Novel:

"A glance at Alice frees me from stain of concupiscence."

Ahh...conjugal bliss and husbandly fealty.

In other books: Thomas Aquinas seemed to like to use this word, and there are lots of other interesting religious texts in Google Books results for concupiscence.