desexualize vs spay

desexualize

verb
  • To divest of sexual attributes; to render conceptually asexual. 

spay

verb
  • To remove or destroy the ovaries and/or uterus (of a female animal) so that she cannot become pregnant. 

noun
  • The act of spaying an animal. 

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