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They described their intent to perform a genome-wide association study, a technique originally developed to locate genetic susceptibilities to diseases like macular degeneration and diabetes. BMC Genetics. Although the exact function of the oSDN is not fully known, its volume, length, and cell number seem to correlate with sexual orientation, and a dimorphism in its volume and of cells could bias the processing cues involved in partner selection. Their results suggested that "genes predisposing to homosexuality may confer a mating advantage in heterosexuals, which could help explain the evolution and maintenance of homosexuality in the population". This study was criticized for its vaguely described method of recruiting twins and for a high rate of psychiatric disorders among its subjects. These areas of the hypothalamus have not yet been explored in homosexual females nor bisexual males nor females. The Telegraph.

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Diversity, Gender, and Sexuality in Nature and People.

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The researchers concluded that there was genetic material being passed down on the X chromosome which both promotes fertility in the mother and homosexuality in her male offspring. They described their intent to perform a genome-wide association study, a technique originally developed to locate genetic susceptibilities to diseases like macular degeneration and diabetes. The new study is about 10 times larger than any previous effort. Bem theorizes that this psychological arousal will later be transformed into sexual arousal:

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Hormones and Behavior.

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