Homosexual/Heterosexual: First Print Uses of the Terms by Daniel von Kászony (1868-1871).

Printed use of the term heterosexuality, as juxtaposed to homosexuality, may be dated to 1871. The German noun pairs Heterosexualität/Homosexualität and adjective pair heterosexuelle/homosexuelle, appeared in two 1871 nonfiction works by hack writer Daniel von Kászony (1813-1886), picking up on Károly Mária Kertbeny's terminology. Kertbeny juxtaposed heterosexual-homosexual in 1868 correspondence but refrained from using the former term in his two famed 1869 open letters to repeal Prussian anti-sodomy legislation. Printed use of the term homosexual may be dated to 1868 or early 1869, by a pseudonymous author that is almost certainly Kászony.