Twins and sexual orientation

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It is also possible that the experience of being a homosexual or a heterosexual has itself impacted the epigenetic profile. In 10 pairs, both brothers were gay. Since the associations have not yet been tested in a completely independent study population, the results should be considered no more than suggestive, caution experts. There was a greater chance for both monozygotic twins to be nonheterosexual than for dizygotic twins or sibling pairs. There needs to be verification before any firm conclusions can be drawn, according to Johnjoe McFadden, a molecular geneticist at the University of Surrey, U. Not that much has changed. Some family studies have reported more homosexuals had homosexual maternal relatives but not paternal relatives.
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What can gay and straight twins tell us about sexuality?

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Scientists find DNA differences between gay men and their straight twin brothers - LA Times

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Scientists find DNA differences between gay men and their straight twin brothers

The researchers will also seek twins who are both gay or bisexual. Since the hypothesis solves the problem of why homosexuality has not been selected out over thousands of years, despite it being antithetical to reproduction, many scientists consider it the best explanatory model for non-heterosexual behaviour such as homosexuality and bisexuality. Psychological development and blood levels of sex steroids in male identical twins of divergent sexual orientation. There is rarely any predictive value for any specific individual s or behavior.
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