I. IntroductionConcurrent with the civil rights movement advocated by the homosexual in Hong Kong, there has been an increased interest by the government to study discrimination based on the ground of sexual orientation. One of the key justifications by the homosexuals in advocating for civil rights protection is the biological basis of such behavior, which is beyond personal choices.The current debate over the origins of homosexuality involves controversial data dealing with genetic research pointing to the question whether sexual orientation derives from nature or nurture. It is, therefore, the purpose of this paper to review the results reported by the...