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Description: The degree to which men who identify as bisexual do so because they have a bisexual orientation has been scientifically controversial. Objective, physiological responses to male and female erotic stimuli can provide compelling evidence for their sexual orientations. Prior studies of this issue have been small, used potentially invalid statistical tests, and produced inconsistent findings. We combined nearly all previously published data, yielding a sample of 474-588 men (depending on analysis). Highly robust results showed that bisexual-identified men’s physiological and subjective arousal patterns were more bisexual than were those who identified as exclusively heterosexual or homosexual. These findings support the view that male sexual orientation contains a range, from heterosexuality, to bisexuality, to homosexuality.