XXX vs titillating

XXX

adj
  • Extra strong; very high quality. 

  • Designating extreme or hardcore pornography. 

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

noun
  • Triple X syndrome. 

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). 

titillating

adj
  • Arousing. 

  • Pleasantly and sensually exciting. 

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