raw dog vs unveil

raw dog

verb
  • To have sex without a condom; to bareback. 

  • To do an activity without protection or intermediary. 

adv
  • Without a condom; bareback. 

unveil

verb
  • To remove a veil; to reveal oneself. 

  • to show, especially for the first time 

  • To remove a veil from; to uncover; to reveal something hidden. 

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