copulation vs gendersex

copulation

noun
  • Sexual procreation between a man and a woman or transfer of the sperm from male to female; usually applied to the mating process in nonhuman animals; coitus; coition. 

  • The act of coupling or joining; union; conjunction. 

gendersex

noun
  • sex or gender. A division of organisms into masculine(man/male), feminine(woman/female) or others by sexual characteristics or social characteristics. 

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