Columbia subject headings:
Harvard subject headings:
Communication--Sex differences
Graffiti--Germany.
Interpersonal communication
Restrooms
Sex differences (Psychology)
Toilets in art.
Princeton subject headings:
German language--Sex differences.
Graffiti--Germany--Sociological aspects.
Graffiti--Sociological aspects.
Sex role--Sociological aspects.
Toilets--Germany--Sociological aspects.
Toilets--Sociological aspects.