Here is a public domain movie that might provide some entertainment and/or inspiration for horror-themed tales:
A major source of inspiration for me is the various bondage-themed covers of comic books and related media throughout the years. Due to social enlightenment issues, the frequency of these has decreased significantly in the 2000s, but the period from the 1940s into the 1980s was a veritable gold mine.
During the second act of the Ninja Girls story I’m working on, the first draft seemed to fall a bit flat. Thankfully, I recalled some recent Tweets (embedded below) from comic book artist and Empowered creator, Adam Warren that gave me an idea on how to improve this piece of the story.