lead in one's pencil vs roger

lead in one's pencil

noun
  • A state of erection of one's penis. 

  • Used other than figuratively or idiomatically: see lead, pencil. 

roger

noun
  • An act of sexual intercourse. 

intj
  • Received (used in radio communications to acknowledge that a message has been received and understood) 

verb
  • Of a man, to have sexual intercourse with (someone), especially in a rough manner. 

  • To have sexual intercourse. 

  • To acknowledge by saying "roger". 

How often have the words lead in one's pencil and roger occurred in a corpus of books? (source: Google Ngram Viewer )