natatorium vs soaking

natatorium

noun
  • A swimming pool, especially an indoor one; a building housing one or more swimming pools. 

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. 

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