Is Bisexuality A Myth?

A recent study from Canada and the US suggests that bisexuality is a myth. Canadian and US researchers recruited 101 men for their study, 33 of whom identified as bisexual. The study found that those that identified as bisexual were actually aroused only by one sex, usually other men. My question is, is this really a responsible study to publish considering the complexity of the issue and the ridiculously small sample that was used? If Kinsey's studies have come under attack and lost credibility/reliability (despite his use of samples of thousands), how can anyone rely on this study as conclusive evidence of the myth of bisexuality? My point is, you can't just put some pictures in front of 33 people, measure their arousal, and then say "bisexuality does not exist". I'm sorry, but it's not that simple.