asexual vs heterosexual

asexual

adj
  • Nonsexual in nature, unmarked by sexual activity. 

  • Without sexual action; reproducing by some other method than sex. 

  • Not experiencing sexual attraction; lacking interest in or desire for sex. 

  • Lacking distinct sex, lacking sexual organs. 

noun
  • A species which reproduces by asexual rather than sexual reproduction, or a member of such a species. 

  • Something which does not have a sex, or a word which refers to such a thing. 

  • A person who does not experience sexual attraction; a person who lacks interest in or desire for sex. 

heterosexual

adj
  • Sexually attracted to members of the opposite sex. 

noun
  • A heterosexual person, or other heterosexual organism. 

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