on lesbians. The findings correspond to those of the earlier research done on gay men. Within 71 lesbians who had an identical twin sister, 48% were both lesbians. And of the 37 lesbians that had a non-identical twin sister, only 16% were both lesbians. It is conclusive that, “…the rate of concordance is substantially higher for identical twins that for non-identical twins argues in favor of a genetic contribution to sexual orientation.”In 1981, Alan Bell, Martin Weinberg, and Sue Hammersmith, of the Kinsey Institute, did another research on this subject. During this study, they recruited 979 homosexual males and females and also 477 heterosexual males and females. They then spent three to five hours in a detailed interview with each subject asking questions about the subject’s childhood and adolescence. The results they found denied any environmental involvement in one’s sexual orientation. They found Freud’s psychoanalytic theory to be “grossly exaggerated.” It seemed that bad relationships with one’s parents have little or no effect on the person’s sexuality. They also found that one’s sexual orientation seemed to be determined before adolescence. So based on their study, environmental factors are inadequate and biological factors are what determines one’s sexuality.There are researches and theories that support nurture, instead of nature, as the cause of sexual orientation. Kenneth Klivington believes that instead of the brain structure having an affect on sexual orientation, it could very well be the other way around. As the Newsweek article states, “One fascinating NIH study found that in people reading Braille after becoming blind, the area of the brain controlling the reading finger grew larger.” Klivington thinks that the brain structures according to experience as he states, “…the brain influences behavior, behavior s...
