true love vs urge to merge

true love

noun
  • A thing for which an individual feels an intense love. 

  • The unique individual for whom one feels such affection. 

  • The situation in which a couple is perfectly compatible and there is no better relationship, as set by a greater force such as God or fate. 

  • The form of romantic affection that is considered pure and wholly positive, not just based on feelings of lust and sex. 

urge to merge

noun
  • A strong desire to form intense emotional connections, stereotypically associated with lesbians. 

How often have the words true love and urge to merge occurred in a corpus of books? (source: Google Ngram Viewer )