What is Bisexuality?

From Psychology Today, By Dr. Brian Mustanski

Skepticism about the existence of people attracted to both men  and women has come from heterosexuals as well as gays and lesbians. Even within the scientific community there has been debate about the existence and meaning of bisexuality. No one seems to argue with the reality that some people have sex with both men and women. The skepticism has centered on if that behavior is motivated by a strong sexual attraction to both sexes.

This debate recently flared up around the publication of an article by Rieger, Chivers, and Bailey that compared the genital and self-reported sexual arousal patterns of men who identified as heterosexual, bisexual, and gay. Men came into a private room in a lab and were shown several films that either included two men having sex with each other or two women having sex with each other. Genital arousal patterns were measured using a gauge that measures changes in the circumference of the penis as it becomes erect. This is also called a penile plethysmograph. Participants also self-reported their sexual arousal by moving a lever backwards and forwards to show increasing or decreasing arousal.

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