For example, some homosexual men identify as bisexual, or engage in sex with women, due to social pressures that favor heterosexuality. Early sex researchers Krafft-Ebing ( 2) and Hirschfeld ( 3) believed that bisexual behavior and identification occurred primarily among monosexual (i.e., either heterosexual or homosexual) men for reasons other than a bisexual orientation. Although some men identify as bisexual and have sexual experiences with men and women, the extent to which this reflects an underlying bisexual orientation has been questioned. The status of male bisexuality as a sexual orientation-that is, the idea that some men are sexually aroused and attracted to both sexes-has a controversial history ( 1). These findings support the view that male sexual orientation contains a range, from heterosexuality, to bisexuality, to homosexuality. Highly robust results showed that bisexual-identified men’s genital and subjective arousal patterns were more bisexual than were those who identified as exclusively heterosexual or homosexual. We combined nearly all previously published data (from eight previous studies in the United States, United Kingdom, and Canada), yielding a sample of 474 to 588 men (depending on analysis).
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Prior studies of this issue have been small, used potentially invalid statistical tests, and produced inconsistent findings. (In contrast, most women provide similar physiological responses to male and female stimuli.) We investigated whether men who self-report bisexual feelings tend to produce bisexual arousal patterns.
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Patterns of physiological (genital) arousal to male and female erotic stimuli can provide compelling evidence for male sexual orientation. Although most bisexual-identified men report that they are attracted to both men and women, self-report data cannot refute these claims. Skeptics believe that male sexual orientation can only be homosexual or heterosexual, and that bisexual identification reflects nonsexual concerns, such as a desire to deemphasize homosexuality. The question whether some men have a bisexual orientation-that is, whether they are substantially sexually aroused and attracted to both sexes-has remained controversial among both scientists and laypersons.