English
allosexual
From allo- (“other”) + sexual.
The story
"Directed at or involving another rather than one's self" and "involving the other sex; heterosexual" are the most etymologically literal senses (regarding the latter sense, compare the structure of heterosexual), structural and semantic opposites of autosexual and isosexual. The sense "non-heterosexual" was influenced by (and had influence on) Canadian French allosexuel.
Today it means
adj Experiencing sexual attraction; not asexual.
Language periods are conventional ranges, not dates for this word.
Etymograph / allosexual