Heterosexual: A person sexually attracted to persons of the opposite sex. Or a person who has sexual relations with the opposite sex. Colloquially known as "straight."
The term "heterosexual" can also be an adjective.

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Heterosexual: A person sexually attracted to persons of the opposite sex. Or a person who has sexual relations with the opposite sex. Colloquially known as "straight."
The term "heterosexual" can also be an adjective.