sultry vs yiffy

sultry

adj
  • Sexually enthralling. 

  • Hot and humid. 

  • Very hot and dry; torrid. 

yiffy

adj
  • Sexually aroused 

  • Of or pertaining to yiff (sexual intercourse among furries). 

How often have the words sultry and yiffy occurred in a corpus of books? (source: Google Ngram Viewer )