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Very young twin girls having sex with each other

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    We fit biometric sex limitation models to three aspects of sexual behavior reported by 4, Finnish twins aged 23— The sample, from five consecutive birth cohorts, of 2, twin pairs sister-sister, brother-sister, brother-brother , included monozygotic and same-sex dizygotic pairs. In addition to model fitting data from twin pairs, we conducted analyses on twins as individuals to test for independence of initiation of sexual behavior from onset age and number of partners. Genetic and non-shared environmental influences were significant for all three measures. There were trends for common environmental influences on initiation and, in females, age at first intercourse.
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    Can Identical Twins Be Different Sexes?

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    Using Twins to Better Understand Sibling Relationships | SpringerLink

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    Identical Twins Become Brother and Sister

    Every parent of twins faces the question "Are your twins identical or fraternal? Many think that being identical twins refers to how twins look and not how they form. Take a look at the biology that determines the sex combinations that are possible with identical and fraternal twins. The terms identical and fraternal don't describe what the twins look like, but actually how they form.
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    We compared the nature of the sibling relationship in dyads of varying genetic relatedness, employing a behavioural genetic design to estimate the contribution that genes and the environment have on this familial bond. Contrary to expectations, no mean level differences emerged when monozygotic twin pairs, dizygotic twin pairs, and non-twin pairs were compared on their sibling relationship quality. Behavioural genetic analyses also revealed that the sibling bond was modestly to moderately influenced by the genetic propensities of the children within the dyad, and moderately to substantially influenced by the shared environment common to both siblings.
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