Usage Note
Heterosexual functions as both a noun (un heterosexual) and an adjective (una persona heterosexual) in Spanish. As a noun it is common gender — the article signals the person's sex: el heterosexual, la heterosexual. The stress falls on the final syllable, unlike the English word.
Examples
"La encuesta incluyó a participantes heterosexuales y homosexuales."
Natural Translation
The survey included heterosexual and homosexual participants.

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