date rape vs violation

date rape

noun
  • Rape committed by an acquaintance of the victim while out on a date. 

  • Rape committed after a perpetrator first secretly administers a sedative or memory-inhibiting drug (a date rape drug) to a victim under the cover of a social setting. 

violation

noun
  • Rape; sexual activity forced on another person without their consent. 

  • An infraction or a failure to follow a rule. 

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