little boys' room vs teahouse

little boys' room

noun
  • Synonym of men's room: a public lavatory intended for use by men. 

  • A room belonging to or used by little boys, particularly their bedroom. 

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. 

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