lulu vs sex on legs

lulu

noun
  • A very attractive or alluring person. 

  • A very bad mistake or error. 

  • A fixed allowance paid to a legislator in lieu of reimbursement for actual expenses. 

  • A remarkable person, object or idea. 

sex on legs

noun
  • A person or persons considered to be very sexually attractive. 

How often have the words lulu and sex on legs occurred in a corpus of books? (source: Google Ngram Viewer )