skin flick       
noun [ C ] US slang uk/ˈskɪn ˌflɪk/ us/ˈskɪn ˌflɪk/
 色情电影
a film that shows sexual acts in a way that is intended to cause sexual excitement but that would be considered unpleasant and offensive by many people
  It's a cheap movie house that only shows skin flicks. 这是一家只放映色情电影的廉价影院。