A level vs buggery

A level

noun
  • anal sex. 

  • A non-compulsory examination taken in the final two years in British high schools; the qualification obtained by passing such an exam 

buggery

noun
  • Anal sex. 

  • A broken or damaged condition. 

  • Any sexual act deemed against nature, such as homosexuality, bestiality or necrophilia. 

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