It's worth remembering that the B-Movie, and hence the posters, have their roots in the Hollywood of the classic era, when films were shorter, and the custom was to have a programme of 2 movies, and a "short", and newsreels; something which was more like a night watching TV than the way a modern cinema runs. Often the second movie was a B-movie. They were shorter, lower-budget, films. Cliched, perhaps, and the posters often were, but hardly bad. Also, you might get them re-using sets and costumes from the big movies, but the setting was often the here-and-now, or some commonplace genre like a Western. And a commonplace of the movie posters, for the more action-filled movies, was the torn female clothing that looked as though it might fall off. And a poster image is one meant to sell the film, not get the film or the advert banned. A silhoutte in a window, rather than a full picture, for instance.