allo vs heterosexual

allo

adj
  • Allosexual and/or alloromantic; experiencing sexual and/or romantic attraction. 

noun
  • One who is allosexual and/or alloromantic. 

heterosexual

adj
  • Sexually attracted to members of the opposite sex. 

noun
  • A heterosexual person, or other heterosexual organism. 

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