bareback vs bollock naked

bareback

adj
  • Without a saddle. 

  • Without a condom. 

verb
  • To have sex without a condom. 

  • To anally penetrate without a condom. 

  • To have anal sex without a condom. 

noun
  • A bird, raised for meat, that lacks feathers, seen as an undesirable trait. 

adv
  • Without a condom. 

  • Without a saddle. 

bollock naked

adj
  • Not wearing clothes. 

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