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Author(s): Hershberger SL
Title: A twin registry study of male and female sexual orientation
Source: JOURNAL OF SEX RESEARCH 34 (2): 212-222
Date: 1997
Document Type: Journal : Proceedings Paper
DOI:
Language: English
Comment:
Address:
Reprint: Hershberger, SL, UNIV KANSAS,DEPT PSYCHOL,426 FRASER HALL,LAWRENCE,KS
66045. E-mail:
Author Keywords:
KeyWords Plus: BEHAVIOR; CHROMOSOME; SELECTION; LINKAGE; SAMPLES; FRANCE
Abstract: Monozygotic (MZ), same-sex dizygotic (DZ) and opposite-sex (OS) twins from the Twin 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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