Sentence:  Surgeons no longer pursue nurses as they did when the former were most likely men and the latter women; now they go for anaesthetists or other surgeons. In one sense <WSD>homogamy</WSD> is desirable, because it means women are less dependent on status-asymmetric marriages; in another, it's dismal because it constitutes a form of social closure ... 
Meaning of the word marked with <WSD> tags:  Marriage or other union between similar people, or people of the same sex.