To make the discussion of biological theories of gender development behavior categories precise, several definitions are necessary. The term gender was borrowed from language grammars by sexologist John Money in 1955 to refer to behavior categories for the treatment of those who were of indeterminate sex. Today, the term continues to refer to behaviors in cultural gender behavior categories regardless of sex category. Gender has to do with behavior. Culture constructs gender categories that define the behaviors expected of people in these categories, as well as rules, norms, and expectations. Gender is not the same as sex from a scientific point of view, although it is unfortunately often used in public discourse as a polite synonym in binary cisgender cultures. Sex has to do with ...