Heterosexuality means sex between people of the opposite gender - from hetero, different .
The terms apply to both women and men. Both homosexual courtships and ongoing homosexual relationships have been observed among lions, porpoises, porcupines, monkeys, and a variety of other animals - despite heterosexual opportunity. Established lesbian and gay couples take more time making love, and place much more emphasis on the exhange of pleasure. Heterosexuals are more goal oriented . One in ten people are estimated to be homosexual.