Sentence:  If a fellow chooses to tell himself that his <WSD>yen</WSD> for the fetching young intern in his office and his concomitant disgruntlement with his aging wife's housekeeping lacunae make perfect Darwinian sense, who am I to argue with him? 
Meaning of the word marked with <WSD> tags:  (desire) A strong desire, urge, or yearning.