teahouse vs women's room

teahouse

noun
  • a public lavatory, particularly (dated US gay slang) as a meeting place for gay men. 

  • A cafe or restaurant that serves tea, usually with light food. 

women's room

noun
  • Synonym of ladies' room: a public lavatory intended for women. 

  • A waiting room in a railway station or other public building intended exclusively for women and usually including a separate women's lavatory. 

How often have the words teahouse and women's room occurred in a corpus of books? (source: Google Ngram Viewer )