lech vs urge to merge

lech

noun
  • A strong, lecherous desire or craving. 

  • A lecher. 

  • The capstone of a cromlech. 

verb
  • To behave lecherously. 

urge to merge

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

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