tunnel of love vs wee-wee

tunnel of love

noun
  • The vagina. 

  • A carnival dark ride for couples in boats, either relaxing and romantic, or spooky (encouraging the couple to cling to one another). 

wee-wee

noun
  • The vulva or vagina. 

  • The penis. 

  • Urine. 

  • An act of urination. 

verb
  • to urinate 

How often have the words tunnel of love and wee-wee occurred in a corpus of books? (source: Google Ngram Viewer )