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TWO ADDITIONAL COMPONENTS OF HUMAN SEXUALITY - page 11 / 29

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SEXUAL ORIENTATION

Studies done in 1991 on twins

Females:

In identical twins, when one twin is a lesbian about 50% of the time the other twin is also a lesbian

In fraternal twins, when one is a lesbian about 16% of the time the sister is also a lesbian

In female siblings when one is a lesbian about 13% of the time the sister is also a lesbian

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