Everyone is different. This has nothing to do with knowing you were gay from the beginning. That is impossible. Most kids are not interested in anything sexual till after 10.
I am sorry if modern science after searching for what? almost 30 years now has found nothing to support it.
some scientific evidence of homosexuality being biological:[FONT="]
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Biological theorists have found substantial instances of anatomical, genetic, and endocrine evidence to support their argument. Experiments in biological research date back as far as the late 1930's, beginning with the pioneering research of Alfred Kinsey (for the University of Indiana) on human sexuality. Kinsey had two goals for his tests: 1) to find out how many adult males engaged in homosexual behavior, and 2) to suggest theories about it came to be [9]. When asked if they had engaged in homosexual sexual relations, a large percent of the population tested answered "no", however when asked if they had engaged in same-sex sexual relations, the percentage answering "yes" nearly doubled. The experiment yielded that 30% of males had experienced at least orgasm in a homosexual act. <snip>[7]. While establishing that as many as 10% of adult males reported having sexual relations with a same-sex partner, this research did little more than to put the word homosexual into common language. [/FONT]
[FONT="]Karen Hooker executed the first psychological test done to test for biological determinism in 1957, on a grant from the National Institute of Mental Health [2]. The study was meant to explore the relationship between homosexuality and psychological development and illness. Hooker studied both homosexuals and heterosexuals. Both groups were matched for age, intelligence quotient (IQ) and education level, and were then subjected to three psychological tests. These three tests, the Rorschach, Thematic Apperception Test (TAT) and the Make-A-Picture-Story Test (MAPS), were then analyzed by psychologists, and the results were tabulated. The results of Hooker's experiment yielded no significant differences in answers on any of the three tests. Because both groups' answers scored very similarly, she concluded a zero correlation between social determinism of sexuality. [/FONT]
[FONT="]As a result of Hooker's finding, the APA removed homosexuality from its Diagnostic and Statistical Manual of Psychological Disorders in 1973. In 1975 it then released a public statement that homosexuality was not a mental disorder. In 1994, two decades later, the APA finally stated, "...homosexuality is neither a mental illness nor a moral depravity. It is the way a portion of the population expresses human love and sexuality" [2]. [/FONT]
[FONT="]D.F. Swaab conducted the next noteworthy experiment in 1990. This experiment became the first to document a physiological difference in the anatomical structure of a gay man's brain. Swaab found in his post-mortem examination of homosexual males' brains that a portion of the hypothalamus of the brain was structurally different than a heterosexual brain. The hypothalamus is the portion of the human brain directly related to sexual drive and function. In the homosexual brains examined, a small portion of the hypothalamus, termed the suprachiasmatic nucleus (SCN), was found to be twice the size of its heterosexual counterpart [2]. [/FONT]
[FONT="]At the same time, another scientist, Laura S. Allen made a similar discovery in the hypothalamus as well. She found that the anterior commissure (AC) of the hypothalamus was also significantly larger in the homosexual subjects than that of the heterosexuals [2]. Both Swaab's and Allen's results became a standing ground for the biological argument on homosexuality. The very fact that the AC and the SCN are not involved in the regulation of sexual behavior makes it highly unlikely that the size differences results from differences in sexual behavior. Rather the size differences came prenatally during sexual differentiation. The size and shape of the human brain is determined biologically and is impacted minutely, if at all by behavior of any kind. [/FONT]
[FONT="]Simon LeVay conducted another experiment regarding the hypothalamus of the human brain in 1991. LeVay, like Swaab and Allen also did a post-mortem examination on human brains; however, he did his examinations on patients who had died from AIDS-related illnesses. He examined 19 declared homosexual man, with a mean age of 38.2, 16 presumed heterosexual men, with a mean age of 42.8, and 6 presumed heterosexual women, with a mean age of 41.2 [3]. LeVay discovered that within the hypothalamus, the third interstitial notch of the anterior hypothalamus (INAH3) was two to three times smaller in homosexual men then in heterosexual men. The women examined also exhibited this phenomenon. LeVay concluded the "homosexual and heterosexual men differ in the central neuronal mechanisms that control sexual behavior", and like Allen and Swaab, agreed that this difference in anatomy was no product of upbringing or environment, but rather prenatal cerebral development and structural differentiation [2]. [/FONT]
[FONT="]Another line of testing done to support the biological perspective are neuroendocrine studies. The neuroendocrine viewpoint's basic hypothesis is that sexual orientation is determined by the early levels (probably prenatal) of androgen on relevant neural structures [7]. If highly exposed to these androgens, the fetus will become masculinized, or attracted to females. This research was conducted on rats at Stanford. The adult female rats that received male-typical levels of androgens sufficiently early in development exhibited male symptoms of attraction. The same was true in the reverse when applied to the male subjects. The female exposed to high levels of the hormone exhibited high levels of aggression and sexual drive toward other females, eventually trying to mount the other females in an act of reproduction. In the males, the subject who received deficient levels of androgen became submissive in matters of sexual drive and reproduction and were willing to receive the sexual act of the other male rat [7]. [/FONT]
[FONT="]A popular route of experimentation in general psychology also did not elude the biological argument. Twin studies have become a highly debated area of experimentation. Ernest Kallman conducted the earliest twin study. He found a 100% concordance between monozygotic (or identical) twins (MZ), and only a 12% concordance for dizygotic (or fraternal) twins (DZ). Although discredited with methodological problems, the early experiment paved the way for a much-publicized team to conduct their twin studies. [/FONT]
[FONT="]J. Michael Bailey and Richard Pillard also studied the gayness between MZ twins, DZ twins, and non-related adopted brothers. They examined how many of the sample population examined were gay and how many were straight. They found that 52% of MZ twins were both self-identified homosexuals, 22% of DZ twins were so, and only 5% of non-related adopted brothers were so. This evidence, repeated and found to be true a second time, showed to the biological camp that the more closely genetically linked a pair is, the more likely they both are to exhibit gay or straight tendencies. Later experimenters found similar evidence in females. One such scientist is Dean Hamer. Hamer examined the possibility of homosexuality being an X-linked trait. He examined the family trees of openly gay men, and thought he saw a maternal link, leading him to investigate his theory of X-linkage. He took 40 DNA samples from homosexual men, and genetically examined them. He found that there was a 'remarkable concordance' for 5 genetic markers on section of the X-Chromosome called Xq28 [2]. [/FONT]
[FONT="]Hamer hypothesized upon examining the family trees of the same men that on each subject's mother's side, there were markedly larger numbers of homosexual men, all stemming through the maternal lineages. This observation, along with his startling discovery on Xq28, led his findings to be dubbed the "gay gene study". The statistical probability of the 5 genetic markers on Xq28 to have matched randomly was calculated to be 1/100,000 [2], lending even more support to his findings. [/FONT]
This finding of a possible 'gay gene' prompts a look into two evolutionary concepts, and how they are affected. The Superior Heterozygote Theory states the phenotypic (actual) expression of homosexuality is the result of homozygosity for recessive (non-expressed but present) genes [11]. In simplification, if the person's genetic code is heterozygotic (one homosexual gene and one heterosexual gene), if the homosexual allele (half of the genetic code) is the allele passed on to the next generation, it will become the phenotype. Heterozygotes are only capable of being passed through to the next generation by mothers (as the Y-chromosome is incapable of heterozygosity), this again links homosexuality to X-linkage.
Homosexuality: Nature or Nurture in AllPsych Journal
The l;ink also explores the [FONT="]
sociobehaviorists argument as well.[/FONT]