Straight

Etimology of Straight

(You may find straight at the world legal encyclopedia and the etimology of more terms).

conventional, especially “heterosexual,” 1941, a secondary sense evolved from straight (adj.1), probably suggested by straight and narrow path “course of conventional morality and law-abiding behavior,” which is based on a misreading of Matthew vii.14 (where the gate is actually strait), and the other influence seems to be from strait-laced.