Article in NYTimes today reporting that a scientific study concluded that men, at least, who identify themselves as bisexual are actually homosexual and denying it.
The study says: "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."
Of course, this study was a sample of about 100--and even if it's scientifically accurate, there are thousands of people who will disagree with it based on their own experience.

See what I read when Bloglines is down?