Sentence:  In one extreme case , cited by a <WSD>Pittsburgh</WSD> psychologist , an office worker 's wife refused to have sexual relations with her husband unless he bought her the luxuries she demanded . 
Meaning of the word marked with <WSD> tags:  a city in southwestern Pennsylvania where the confluence of the Allegheny River and Monongahela River forms the Ohio River; long an important urban industrial area; site of Carnegie Mellon University and the University of Pittsburgh