samples in saliva from 37 pairs of identical twins in which only one twin was gay, and 10 pairs in which both were gay. By scanning the twins epigenomes, the researchers found five epi-marks that were more common among the gay men than in their genetically identical straight brothers. An algorithm they developed based on the five epi-marks could correctly predict the sexual orientation of men in the study 67% of the time. UCLA computational geneticist Tuck Ngun will present the work on 8 October at the American Society of Human Genetics meeting in Baltimore, Maryland."Trans Women created by Nature or God (whatever you wanna call):Another factor that leads us to believe in the power of natural hormonal factor is: A woman who has the complete androgen insensitivity syndrome (CAIS). It is a seemingly normal woman with desires of heterosexual woman, born with all feminine attributes but is GENETICALLY MAN, and the gonads in these women are not ovaries, but instead are undescended testicles. Soon they are sterile, they can not have children, and then also do not menstruate, do not have the underarm hair, and has problems like (small) not fully developed vagina. Otherwise, women are perfect, indistinguishable to the layman, and living a lifelong heterosexual women. Holders of CAIS were never influenced by testosterone, not during fetal life, thus their bodies and brains grow up believing that they were female. The person with CAIS produces lots of testosterone, but as it is not identified by cell receptors, ie, no cell of her body realizes that there is a lot of testosterone there ... no matter how much testosterone due to one or more genetic mutations, and therefore, do not generate the masculinizing effects of the organism, not even in the brain.It's like she does not feel the taste of chocolate, even eating dark chocolate... http://en.wikipedia.org/wiki/Complete_androgen_insensitivity_syndromeWomen with complete androgen insensitivity are born female, despite having a 46, XY karyotype, genetically male. http://en.wikipedia.org/wiki/Complete_androgen_insensitivity_syndrome Major global health organizations, including many of psychology, no longer consider homosexuality a disease, disorder or perversion. Since 1973, homosexuality is no longer classified as such by the American Psychiatric Association. In 1975 the American Psychological Association adopted the same procedure, failing to consider homosexuality a disease. [20] In Brazil, in 1984, the Brazilian Association of Psychiatry (ABP) stood against discrimination and considered homosexuality as something not harmful to society. [21] in 1985, BPA was followed by the Federal Council of Psychology, who stopped considering homosexuality a sexual deviation and, in 1999, established rules for the work of psychologists in relation to issues of sexual orientation, stating that "homosexuality is not an illness or disorder or a perversion" and that psychologists do not collaborate with events and services that propose the treatment and / or cure of homosexuality. [22] [23] on May 17, 1990, the Assembly -General of the World Health Organization (acronym WHO) removed homosexuality from its list of mental illnesses, the International Classification of Diseases (ICD acronym). [23] [20] Finally, in 1991, Amnesty International has considered the discrimination against homosexuals a violation of human rights. The American