“Before [the 1950s], homosexuality was understood and articulated through the lens of hetereonormativity. The assumption was that desire itself was heterosexual.
This assumption made it inconceivable that males might desire other males as males, or that females might desire other females as females. Instead, clinicians insisted that males who desired other males possessed a female subjectivity, and that women who desired women were psychologically male (hence the [pathologized] term ‘invert’, which was widely used in medical and popular contexts to designate homosexuals).”
Deb Cameron and Don Kulick, Language and Sexuality