Unified Approach in Sexual Orientation

Paper Summary:

Current researchers have approached the question of sexual preference and its causes from a biological as well as a psychological and sociological point of study. Both types of researchers would agree that the various areas of influence are not necessarily exclusive of one another, and that no single area dominates the decision as to what determines sexual orientation. The paper shows that some researchers have demonstrated a biologic or genetic component of human sexual orientation. Others dispute this claim, stating that sexuality is largely an environmentally-influenced preference. In conclusion, this paper argues that it is clearly necessary to approach the causes of sexual orientation from a point of view that includes both biologic and environmental factors.

From the Paper:

"Blanchard and Klassen have hypothesized that the Y-linked minor histocompatiblity antigens, or H-Y antigens, are involved in sexual development. Their study shows that some mothers experience a progressive immunization to the antigen, and that this change may increase the effects of H-Y antibodies on the sexual differentiation of the brain in male children that are born later in the birth order within a family. According to the authors, this information is consistent with the fact that there is a correlation between sexual orientation in men and the number of older brothers they have. Each older brother increases the odds of homosexual preference by nearly 33% in the younger siblings."

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