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A Twin Registry Study of Male and Female Sexual Orientation

Scott L. Hershberger
The Journal of Sex Research
Vol. 34, No. 2 (1997), pp. 212-222
Published by: Taylor & Francis, Ltd.
Stable URL: http://www.jstor.org/stable/3813571
Page Count: 11
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A Twin Registry Study of Male and Female Sexual Orientation
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Abstract

Monozygotic (MZ), same-sex dizygotic (DZ), and opposite-sex (OS) twins from the Minnesota Twin Registry responded to a sexual orientation survey. Using the relative frequencies of heterosexuals, bisexuals, and homosexuals responding to the survey and generalizing these frequencies to the entire Registry, the prevalence of bisexuality among women was estimated as 1.58% and among men, 2.08%. For homosexuality, prevalence rates for women and men were 1.68% and 2.49%, respectively. Homosexual and heterosexual attraction, behavior, and self-identification were significantly more heritable in women than men. For men, no significant genetic effects were found for number of opposite- and same-sex sexual encounters, nor for sexual orientation. No evidence was found for different genes influencing the sexual orientation of men and women.

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