Desire for amputation of a limb: paraphilia, psychosis, or a new type of identity disorder - BIID-Info.org
There is always something new to learn about our own brain and how wirings can get crossed or simple chemical imbalance in the brain to cause a variety of mental illnesses not yet realized or understood clearly. If Gender Identity Disorder exists so does the possibility that BIID exist as well. The brain can indeed be a strange little universe of its own with all the quirks and normalcy.