Columbia subject headings:
Harvard subject headings:
Sex role--Europe--History
Sex role--United States--History
Sex--Europe--History--20th century.
Sex--Europe--History--21st century.
Sex--Political aspects--Europe.
Sex--Political aspects--United States.
Sex--United States--History--20th century.
Sex--United States--History--21st century.
Princeton subject headings:
Sex--Europe.
Sex--United States.