Here is a list of international film ratings for The Rocky Horror Picture Show:

United States:

For strong sexual content including dialogue, violence and language
by the Motion Picture Association of America

United Kingdom:

For strong language, some moderate sex/nudity, and some moderate violence
by the British Board of Film Classification

Australia:

For sexual references
by the Office of Film & Literature Classification

Finland:

For sexual references
by Valtion elokuvatarkastamo