Demagogue

A new study reveals that men who identify as bisexual are exposed as liars by their own best friends-- their penises.

In the new study, a team of psychologists directly measured genital arousal patterns in response to images of men and women. The psychologists found that men who identified themselves as bisexual were in fact exclusively aroused by either one sex or the other, usually by other men.

The study is the largest of several small reports suggesting that the estimated 1.7 percent of men who identify themselves as bisexual show physical attraction patterns that differ substantially from their professed desires.
...
"Research on sexual orientation has been based almost entirely on self-reports, and this is one of the few good studies using physiological measures," said Dr. Lisa Diamond, an associate professor of psychology and gender identity at the University of Utah, who was not involved in the study.

The discrepancy between what is happening in people's minds and what is going on in their bodies, she said, presents a puzzle "that the field now has to crack, and it raises this question about what we mean when we talk about desire."

"We have assumed that everyone means the same thing," she added, "but here we have evidence that that is not the case."

For the record, I don't necessarily think that a person's sexuality or desires can be measured by genital response alone, but this is an interesting study nonetheless.