prurient vs rock hard

prurient

adj
  • Arousing or appealing to sexual desire. 

  • Curious, especially inappropriately so. 

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

rock hard

adj
  • Having a very fully erect and stiff penis 

  • With strongly held beliefs and opinions, deep conviction. 

  • As tough, hard, or inflexible as a piece of rock. 

  • With muscles developed and toned to a high degree, especially the muscles of the abdomen. 

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