 Linguistically, there isn't any real difference between "gender bias" and "sex bias", and it may seem contrived to insist that "sex" is incorrect in this instance.A working definition in use by the World Health Organization for its work is that "'[g]ender' refers to the socially constructed roles, behaviours, activities, and attributes that a given society considers appropriate for men and women" and that "'masculine' and 'feminine' are gender categories.