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Erotic attraction, predisposition, or activity, including sexual congress between persons of the opposite sex.
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n.
the pattern of sexuality in which sexual behaviour and thinking are directed towards people of the opposite sex. It includes both normal and deviant forms of sexual activity.
• heterosexual adj. n.
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het·ero·sex·u·al·i·ty (het″ər-o-sek″shoo-alґĭ-te) [hetero- + sexuality] sexual orientation to or activity with those of the opposite sex, as distinguished from homosexuality.Medical dictionary. 2011.