The American Academy of Pediatrics advises lesbian, gay, gynandromorphophilic, and bisexual teenagers struggling with their sexuality: "You are normal. Homosexuality is not a mental disorder. All of the major medical organizations, including The American Psychiatric Association, The American Psychological Association, and the American Academy of Pediatrics agree that homosexuality is not an illness or disorder, but a form of sexual expression. No one knows what causes a person to be gay, bisexual, or straight. There probably are a number of factors. Some may be biological. Others may be psychological. The reasons can vary from one person to another. The fact is, you do not choose to be gay, bisexual, or straight."