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Abstract
Sixty-one pairs of twins and 3 sets of triplets composed the sample for this study. Participants were initially contacted by telephone and then asked to be interviewed and/or to complete a questionnaire, with confidentiality assured. An 18-page questionnaire on the sexuality of the twins was used to-assess such questions as age, sex, zygosity, whether reared together or not, and sexual orientation of the respondents. Zygosity was measured using the Nichols and Bilbro instrument, with sexual orientation measured using the Kinsey Scale. Data were analyzed using behavioral genetic analysis. It was found that genes do influence career choice, that is, identical twins are more related to one another in career choice than fraternal twins. Sexual orientation was found to influence career choice. However, the same genes were not found to influence sexual orientation and career choice. These findings add to the empirical literature supporting the concept that sexual orientation and career choice are biologically influenced.
