Wanton

 I am using the word as a synonym for a strong desire.  Sexual desire is a metaphor for the intensity of the urge.

Main Entry:

¹wan·ton

Pronunciation:

\ˈwȯn-t^ən, ˈwän-\

Function:

adjective

Etymology:

Middle English, from wan- deficient, wrong, mis- (from Old English, from wan deficient) + towen, past participle of teen to draw, train, discipline, from Old English tēon — more at tow

Date:

14th century

1 aarchaic : hard to control : undisciplined , unruly b: playfully mean or cruel : mischievous2 a: lewd , bawdy b: causing sexual excitement : lustful , sensual3 a: merciless , inhumane <wanton cruelty> b: having no just foundation or provocation : malicious wanton attack>4: being without check or limitation: as a: luxuriantly rank <wanton vegetation> b: unduly lavish : extravagant <wanton imagination>

 

Source:

 

http://www.merriam-webster.com/dictionary/wanton