XXX vs crude

XXX

verb
  • To delete; to cross out, especially to conceal or suggest vulgar language. 

symbol
  • An indicator of hazard or poison. 

  • Traditional brewer's mark for barrels of extra strong beer—extended to other alcoholic beverages and other products having an extra strong dimension (varying from laundry soap to pornography). 

noun
  • Triple X syndrome. 

adj
  • Extra strong; very high quality. 

  • Designating extreme or hardcore pornography. 

crude

adj
  • In a natural, untreated state. 

  • Characterized by simplicity, especially something not carefully or expertly made. 

  • Lacking tact or taste. 

  • Lacking concealing elements. 

  • Pertaining to the uninflected stem of a word. 

noun
  • Any substance in its natural state. 

  • Crude oil. 

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