Like any other Hollywood classic, Eleanor Parker's 1957 film The Seventh Sin got it's fair share of publicity.
First, you have the build-up. A year and a half before The Seventh Sin was released theatrically came the announcement that Eleanor Parker would star in the film. Ava Gardner was originally attached to the picture.
Second, you have a nice poster advertising the film. Taglines like "The world forgives many things but not...The Seventh Sin" and "MGM's drama of modern morals in reckless Hong Kong" are there to pique interest. An adult entertainment label is also clearly visible which lets one know right away that the film is risqué.
A photo with caption to generate even more interest:
A quick, generally positive review/summary of the film:
A pair of crisp black & white promotional photos:
I don't think that The Seventh Sin was as big a financial hit as MGM may have wanted. Solution? Play it on TV! Here is an ad for a television rebroadcast of the film from a decade after it was released: