soaking vs sponging

soaking

noun
  • Immersion in water; a drenching or dunking. 

  • The practice of inserting a penis into a vagina and remaining stationary, without thrusting, supposedly used by some conservative Christians in lieu of traditional sexual intercourse. 

adj
  • Of rain, heavy but slow enough to penetrate deeply into the top soil. 

  • Extremely wet; saturated. 

sponging

noun
  • The application of a sponge. 

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