1914 9 July 12/5 (headline) Sex film at Grand is given the O.K. by local censors.
1970 10 Dec. 10/4 From time to time we have to see, not sex films, but sex-instruction films.
2003 M. Bronski iv. 255 Sex films of the fifties that were introduced by a ‘doctor’ explaining why the movie was ‘educational’.