nympholepsy vs urge to merge

nympholepsy

noun
  • A frenzied state of (usually erotic) emotion, especially concerning something or someone unattainable. 

urge to merge

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

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