This is not surprising when we consider that heterosexual behavior (coitus) is responsible for the reproduction of human beings - persons disinclined to sexual behavior with members of the opposite sex have been at a considerable reproductive disadvantage.
According to some studies, notably [Sexual Behavior in the Human Male]? (1948) and [Sexual Behavior in the Human Female]? (1953) by Dr. Alfred C. Kinsey, note that when asked to rate themselves on a continuum from completely heterosexual to completely homosexual, and when the individuals behavior as well as their identify is analyzed, the majority of people appear to be at least somewhat bisexual. Most people have some attraction to either sex, although usually one sex is preferred. Only a minority (5-10%) can be considered fully heterosexual or homosexual. Conversely, only an even smaller minority can be considered "fully" bisexual.
Heterosexuality is colloquially referred to as being "straight", although that term can also mean anyone whose sexuality could be described as orthodox. For example, people who practice BDSM use the term to refer to anyone who does not.
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