ding-a-ling vs membrum virile

ding-a-ling

adj

  • Attractive. 

noun

  • The penis. 

  • An eccentric or crazy person. 

  • The sound of a small bell; the sound of a fire engine bell. 

membrum virile

How often have the words ding-a-ling and membrum virile occurred in a corpus of books? (source: Google Ngram Viewer )