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Abstract: An 8 page exploration of the genetic basis for homosexuality verses heterosexuality. Discusses the advancements in genetic research which link chromosomal differences with sexual behavior. Emphasizes the link between the X chromosome in men and sexual behavior. Discusses potential differences in brain development between heterosexual men and homosexual men. Concludes that while there is no incontestable proof regarding a genetic basis for sexual behavior there are numerous tentative findings which would suggest this is the case, Bibliography lists 5 sources.