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general::
Phrase(s): the opposite sex
the other sex; (from the point of view of a female) males; (from the point of view of a male) females. (Also with member of, as in the example.) • Ann is crazy about the opposite sex. • Bill is very shy when he’s introduced to the opposite sex. • Do members of the opposite sex make you nervous?
McGrawhill's American Idioms And Phrasal Verbs