condom vs johnny

condom

noun
  • A flexible sleeve made of latex or other impermeable material such as sheepskin, worn over an erect penis during sexual intercourse as a contraceptive or as a way to prevent the spread of STDs. 

johnny

noun
  • A condom. 

  • An inexperienced new worker, usually an immigrant. 

  • A hospital gown: a gown with a back opening closed with snaps or ties, worn by hospital patients. 

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