You've Changed

Is sex identity a feature of one''s mind or body, and is it a relational or intrinsic property? Who is in the best position to know a person''s sex, do we each have a true sex, and is a person''s sex an alterable characteristic? When a person''s sex assignment changes, has the old self disappeared and a new one emerged; or, has only the public presentation of one''s self changed? "You''ve Changed...