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TWO ADDITIONAL COMPONENTS OF HUMAN SEXUALITY - page 12 / 29

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SEXUAL ORIENTATION

Determination of sexual orientation can not be wholly genetic

If it were concordant then identical twins would either both be homosexual or heterosexual, the way that traits like Down syndrome or cystic fibrosis or color blindness are.

When a trait is wholly genetic then the concordance in twins is equal to one.

With homosexuality only 1/2 of the time are both twins gay.  

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