If one twin is gay is the other
Title: Homosexual Orientation in Twins: A Announce on 61 Pairs and Three Triplet Sets
REFERENCES
Bailey, J. M., and Pillard R. C. (1991). A genetic study of male sexual orientation. Arch. Gen. Psychiat. 48: 1089-1096.
Bouchard, T. J., Lykken, D. T., McGue, M., Segal, N. L., and Tellegen, A. (1990). Sources human psychological differences: The Minnesota study of wins reared apart. Science 250: 223-228.
Davison, K., Brierley, H., and Smith, C. (1971). A male monozygotic twinship discordant for homosexuality. Br. J. Psychiat. 118: 675-682.
Diamond, M. (1965). A critical evaluation of the ontogeny of human sexual behavior. Quart. Rev. Biol. 40: 147-175.
Diamond, M. (1976). Human sexual development: Hereditary Foundation for social development. In Beach, F. A. (ed), Human Sexuality in Four Perspectives, Johns Hopkins Press, Baltimore, MD, pp. 22-61.
Diamond, M. (1979). Sexual identity and sex roles. In Bullough, V. (ed), The Frontiers of Sex Research, Prometheus, Buffalo, NY, pp. 33-56.
Diamond, M. (1982). Sexual identity, monozygotic twins reared in discordant sex roles and a BBC follow-up. Arch. Sex. Behav. 11: 181-185.
Diamond, M. (1993). Homosexu
Is a person ‘born gay’, or is being gay a learned behavior?
Being homosexual is not a choice for people. Instead, it appears to be a fundamental part of who someone is. It is not a learned deed. Which also means that people cannot “unlearn” their sexual orientation.
Of course just because we recognize it isn’t usually a learned conduct, that doesn’t represent that we hold a good explanation for what is going on biologically. We don’t.
What we do know is that there isn’t one single gene that explains homosexuality. Something as complicated as sexual orientation is going to involve lots of genes. And not only that, but it will involve the environment too.
Now by the environment I don’t just mean an overprotective mom or a domineering dad. “Environment” is a catchall for everything that isn’t a gene. For instance, what the fetus experienced while in the mother’s womb can affect its maturation and influence habit later on in life.
So even though you might await that the environment only causes temporary changes, that’s not always the case. The environment can cause brains to be wired in a certain way as it develops. This wiring can’t be changed easily.
Right now the
Why Do Some Identical Twins Own Different Sexual Orientations?
by Justin Lehmiller
A growing amount of research suggests that sexual orientation has a genetic basis. In fact, scientists recently identified two specific genes that appear to differ between gay and straight men [1].
If sexual orientation is indeed genetically determined, it would be tempting to assume that identical twins would always have the identical orientation, right? If they include the exact same genes and our genes control our sexuality, this would seem like a pretty logical conclusion. As it turns out, however, it’s not accurate.
Identical twins sometimes have alternative orientations. For example, one may be straight while the other is gay. So why is that?
In cases like this, some might argue that perhaps both twins are actually gay, but one just hasn’t come out yet. In other words, maybe there isn’t a true discrepancy. But this idea has been refuted scientifically.
In a study where scientists looked at the sexual arousal patterns of identical twins with different sexualities—specifically, where one was gay and the other was straight—they found that lgbtq+ twins demonstrated more genital arousal in respon
Identical twins and sexual identity
Staff Writer | Sarasota Herald-Tribune
Dear Dr. Roach: I read your recent column regarding resembling twins where one of the two was balding while his twin was not. Within my extended family, there are equal twin brothers, who also were almost impossible for family members to differentiate. If their DNA genes are "identical," now that they are adults, how can one be queer, while his twin is married with children? — Anon.
Dear Anon.: Sexual culture defies a simple, unattached explanation and even categorization. As time goes on, scientists have recognized that not everybody fits into the clear-cut categories of "straight" and "gay." Some people are attracted to both sexes; some to neither; some feel that traditional gender roles don't really fit them. As such, trying to determine a single cause of sexual identity, genetic or environmental, is not going to be successful. With increasing recognition that people do not fall into binary categories, we can see the limitations of studies that have attempted to answer your ask. Nonetheless, the data is useful to look at.
Studies have shown that in identical twins, if