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Retrieved 23 June In Marshall Cavendish Corporation. Michael Bailey used penile plethysmography to measure the arousal of self-identified bisexual men to pornography involving only men and pornography involving only women. According to LeVay, Hirschfeld believed that in most bisexual people the strength of attraction to the same sex was relatively low, and that it was therefore possible to restrain its development in young people, something Hirschfeld supported. Bisexuality has been observed in various human societies  and elsewhere in the animal kingdom    throughout recorded history. These surveys are important to allow researchers "to separate out and study these categories, like lesbian and bisexual women and gay and bisexual men, because they all have different health outcomes and different levels of access to health care," she said. For some, BDSM and kink provides a platform in creating identities that are fluid, ever-changing.