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Sexual orientation is an enduring personal pattern of romantic attraction or sexual attraction to persons of the opposite sex or gender, the same sex or gender, or to both sexes or more than one gender. Patterns are generally categorized under heterosexuality, homosexuality, and bisexuality, while asexuality is sometimes identified as the fourth category.
The relationship between biology and sexual orientation is a subject of on-going research. While scientists do not know the exact cause of sexual orientation, they theorize that it is caused by a complex interplay of genetic, hormonal, and environmental influences. However, evidence is weak for hypotheses that the post-natal social environment impacts sexual orientation, especially for males.
The field of psychology has extensively studied homosexuality as a human sexual orientation. The American Psychiatric Association listed homosexuality in the DSM-I in 1952, but that classification came under scrutiny in research funded by the National Institute of Mental Health. That research and subsequent studies consistently failed to produce any empirical or scientific basis for regarding homosexuality as anything other than a natural and normal sexual orientation that is a healthy and positive expression of human sexuality. As a result of this scientific research, the American Psychiatric Association removed homosexuality from the DSM-II in 1973. Upon a thorough review of the scientific data, the American Psychological Association followed in 1975 and also called on all mental health professionals to take the lead in "removing the stigma of mental illness that has long been associated" with homosexuality. In 1993, the National Association of Social Workers adopted the same position as the American Psychiatric Association and the American Psychological Association, in recognition of scientific evidence. The World Health Organization, which listed homosexuality in the ICD-9 in 1977, removed homosexuality from the ICD-10 which was endorsed by the 43rd World Health Assembly on 17 May 1990.
Kurt Freund was a Czech-Canadian physician and sexologist best known for developing the penile plethysmograph, research studies in pedophilia, and for the "courtship disorder" hypothesis as a taxonomy of certain paraphilias. After unsuccessful attempts to change men's sexual orientation, he advocated against conversion therapy and in favor of the decriminalization of homosexuality.
John Michael Bailey is an American psychologist, behavioral geneticist, and professor at Northwestern University best known for his work on the etiology of sexual orientation and paraphilia. He maintains that male sexual orientation is most likely established in utero.
Fraternal birth order, also known as the older brother effect, has been correlated with male sexual orientation, with a significant volume of research finding that the more older brothers a male has from the same mother, the greater the probability he will have a homosexual orientation. Ray Blanchard and Anthony Bogaert first identified the association in the 1990s and named it the fraternal birth order effect. Scientists have attributed the effect to a prenatal biological mechanism, since the association is only present in men with older biological brothers, and not present among men with older step-brothers and adoptive brothers. The mechanism is thought to be a maternal immune response to male fetuses, whereby antibodies neutralize male Y-proteins thought to play a role in sexual differentiation during development. This would leave some regions of the brain associated with sexual orientation in the 'female typical' arrangement – or attracted to men. Biochemical evidence for this hypothesis was identified in 2017, finding mothers with a gay son, particularly those with older brothers, had heightened levels of antibodies to the NLGN4Y Y-protein than mothers with heterosexual sons.
Androphilia and gynephilia are terms used in behavioral science to describe sexual orientation, as an alternative to a gender binary homosexual and heterosexual conceptualization. Androphilia describes sexual attraction to men and/or masculinity; gynephilia describes the sexual attraction to women and/or femininity. Ambiphilia describes the combination of both androphilia and gynephilia in a given individual, or bisexuality.
Ego-dystonic sexual orientation is a highly controversial mental health diagnosis that was included in the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM) from 1980 to 1987 and in the World Health Organization's (WHO) International Classification of Diseases (ICD) from 1990 to 2019. Individuals could be diagnosed with ego-dystonic sexual orientation if their sexual orientation or attractions were at odds with their idealized self-image, causing anxiety and a desire to change their orientation or become more comfortable with it. It describes not innate sexual orientation itself, but a conflict between the sexual orientation a person wishes to have and their actual sexual orientation.
The Klein Sexual Orientation Grid (KSOG) developed by Fritz Klein attempts to measure sexual orientation by expanding upon the earlier Kinsey scale. Fritz Klein founded the American Institute of Bisexuality in 1998 which is continuing his work by sponsoring bisexual-inclusive sex research, educating the general public on sexuality, and promoting the bisexual community.
Xq28 is a chromosome band and genetic marker situated at the tip of the X chromosome which has been studied since at least 1980. The band contains three distinct regions, totaling about 8 Mbp of genetic information. The marker came to the public eye in 1993 when studies by Dean Hamer and others indicated a link between the Xq28 marker and male sexual orientation.
Childhood gender nonconformity (CGN) is a phenomenon in which prepubescent children do not conform to expected gender-related sociological or psychological patterns, or identify with the opposite sex/gender. Typical behavior among those who exhibit the phenomenon includes but is not limited to a propensity to cross-dress, refusal to take part in activities conventionally thought suitable for the gender and the exclusive choice of play-mates of the opposite sex.
The relationship between the environment and sexual orientation is a subject of research. In the study of sexual orientation, some researchers distinguish environmental influences from hormonal influences, while other researchers include biological influences such as prenatal hormones as part of environmental influences.
Sexual fluidity is one or more changes in sexuality or sexual identity. Sexual orientation is stable for the vast majority of people, but some research indicates that some people may experience change in their sexual orientation, and this is slightly more likely for women than for men. There is no scientific evidence that sexual orientation can be changed through psychotherapy. Sexual identity can change throughout an individual's life, and does not have to align with biological sex, sexual behavior, or actual sexual orientation.
Richard C. Friedman was an academic psychiatrist, the Clinical Professor of Psychiatry at Weill Cornell Medical College, and a faculty member at Columbia University. He has conducted research in the endocrinology and the psychodynamics of homosexuality, especially within the context of psychoanalysis. Friedman was born in The Bronx, New York.
The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation that emerges later in the individual. Prenatal hormones may be seen as the primary determinant of adult sexual orientation, or a co-factor.
Ronald Lindsay André "Ron" Langevin is a Canadian forensic psychologist at the University of Toronto. He is the founding editor of Annals of Sex Research, now titled Sexual Abuse: A Journal of Research and Treatment.
James Donald "Jim" Weinrich is an American sex researcher and psychobiologist. Much of his work examines the relationship of biology and sexual orientation. He won the Outstanding Contributions to Sexual Science Award at the 2011 Society for the Scientific Study of Sexuality (SSSS) Western Region annual meeting. He has also won the SSSS Hugo Beigel Award for the best paper published in The Journal of Sex Research. Weinrich served as the editor-in-chief of the Journal of Bisexuality from 2011 to 2014. He has also served on the editorial boards for The Journal of Sex Research and the Journal of Homosexuality.
Betty Wilson Steiner-Conduit was a Canadian psychiatrist. Steiner was the first head of the Gender Identity Clinic at the Clarke Institute of Psychiatry. She is known for her work with transgender and intersex people.
Frederick Lee "Fred" Whitam was an American sociologist who studied homosexuality from a cross-cultural perspective. Scholar Paul Vasey described Whitam as "an essentialist during a time of rampant social constructionism."
Homosexuality was classified as a mental disorder in the Diagnostic and Statistical Manual of Mental Disorders (DSM) beginning with the first edition, published in 1952 by the American Psychiatric Association (APA). This classification was challenged by gay rights activists during the gay liberation following the 1969 Stonewall riots, and in December 1973, the APA board of trustees voted to declassify homosexuality as a mental disorder. In 1974, the DSM was updated and homosexuality was replaced with a new diagnostic code for individuals distressed by their homosexuality, termed ego-dystonic sexual orientation. Distress over one's sexual orientation remained in the manual, under different names, until the DSM-5 in 2013.
References
- ↑ Mass L (1990). Homophobia on the couch: A conversation with Richard Pillard, first openly gay psychiatrist in the United States. in Homosexuality and Sexuality: Dialogues of the Sexual Revolution—Volume I (Gay & Lesbian Studies). Haworth Press, ISBN 0918393892
- ↑ Judson Jerome (Mar., 1958). Departure: Basil Pillard, 1895-1957. College English, Vol. 19, No. 6, Poetry and Professors Issue , p. 240
- ↑ Paul E. Lynch (2003). An Interview with Richard C. Pillard, MD. Journal of Gay & Lesbian Psychotherapy Volume: 7 Issue: 4
- ↑ Burr, Chandler (June 1997). Homosexuality and biology. The Atlantic Monthly
- ↑ Talan, Jamie (August 19, 1986). Of Gays And Gay Siblings. Newsday
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