Fraternal birth order effect on sexual orientation explained
نویسندگان
چکیده
منابع مشابه
Fraternal birth order effect on sexual orientation explained.
Twenty years ago, Ray Blanchard and Anthony Bogaert demonstrated that the probability of a boy growing up to be gay increases for each older brother born to the same mother, the so-called fraternal birth order (FBO) effect. Their first investigation indicated that each older brother increased the probability of being gay by about 33% (1). This startling phenomenon was confirmed in multiple stud...
متن کاملO brother, where art thou? The fraternal birth-order effect on male sexual orientation.
S igmund Freud has a lot to answer for. As the 20th century began, he convinced medical professionals that abnormal family relationships caused children to develop a homosexual orientation, which could be ‘‘cured’’ by psychoanalysis. Not until the 1970s would psychiatric and psychological associations finally repudiate this idea that gay people have any illness that needs treating. Since then, ...
متن کاملOn the Mathematics of Fraternal Birth Order Effect and the Genetics of Homosexuality
Mathematicians have always been attracted to the field of genetics. I am especially interested in the mathematical aspects of research on homosexuality. Certain studies show that male homosexuality may have a genetic component that is correlated with female fertility. Other studies show the existence of the fraternal birth order effect, that is the correlation of homosexuality with the number o...
متن کاملBirth order and sexual strategy§
According to F. J. Sulloway [Sulloway, F. J. (1996). Born to rebel. New York: Pantheon], firstborns can minimize the diversion of parental investment to younger siblings by upholding their parents’ beliefs, or the parental ‘‘status quo.’’ Maintenance of the status quo may translate into the pursuit of different sexual strategies as a function of birth order. Accordingly, Sulloway hypothesized t...
متن کاملInteraction of fraternal birth order and handedness in the development of male homosexuality.
The present study investigated evidence for an interaction between two of the best established etiologic factors, or markers of etiologic factors, in the literature on male homosexuality: fraternal birth order and hand preference. By combining five samples, the authors produced study groups of 1774 right-handed heterosexuals, 287 non-right-handed heterosexuals, 928 right-handed homosexuals, and...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2017
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1719534115