babymaker vs lead in one's pencil

babymaker

noun
  • The penis. 

  • One whose role it is to reproduce. 

  • Somebody who gives birth to a baby. 

lead in one's pencil

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

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

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