Genetics, Environment Shape Sexual Behavior

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The study, which was published in the journal Archives of Sexual Behavior, shows that while genetic factors are important, non-shared environmental factors are dominant in determining sexual orientation.

"This study is not without its limitations -- we used a behavioral measure of sexual orientation which might be okay to use for men (men's psychological orientation, sexual behavior, and sexual responses are highly related) but less so for women (who show a clearer separation between these elements of sexuality)," Rahman noted. "Despite this, our study provides the most unbiased estimates presented so far of genetic and non-genetic contributions to sexual orientation."

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The American Psychological Association has more about sexual orientation.

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-- Robert Preidt