off-color vs prurient

off-color

adj
  • Dirty, vulgar or obscene, especially in a way that is unpleasant. 

  • Feeling mildly unwell. 

  • Different than usual. 

  • Of the wrong color. 

prurient

adj
  • Curious, especially inappropriately so. 

  • Arousing or appealing to sexual desire. 

  • Uneasy with desire; itching; especially, having a lascivious anxiety or propensity; lustful. 

How often have the words off-color and prurient occurred in a corpus of books? (source: Google Ngram Viewer )