gender 'a university grievance committee decided she had been denied tenure because of her gender'(the new York times) Gender originally strictly a grammatical term, became in the nineteenth century a euphemism for the convenience of those who found 'sex' too disturbing a word to utter. In use today in that sense is disdained by most authorities as old-fashioned and over-delicate.
This is a book written in 2001. A reworking of a 1983 book he wrote. I wonder what his 2017 revision would say.