balls vs spermatozoon

balls

noun
  • The testicles. 

  • A balls-up; a botched job. 

  • Masculinity, particularly strength, courage, and force of will; chutzpah; brazeness. 

  • Synonym of bollocks, nonsense. 

adv
  • Very. Intensifier. 

verb
  • Speaking or acting with bravado to achieve (something) 

  • To engage in sexual intercourse. 

spermatozoon

noun
  • A reproductive cell or gamete of a male, carried in semen, that fertilizes an ovum to produce a zygote. 

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