According to the potential genetic basis of homosexuality,studies of identical twins have revealed that when one twin self-identifies as gay or lesbian:

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Studies of identical twins suggest that genetic factors are involved in determining sexual orientation. When one twin self-identifies as gay or lesbian, the other twin is more likely to self-identify as gay or lesbian than is a random member of the population, even when the twins were raised apart. This suggests that there is a genetic component to sexual orientation, as opposed to just environmental factors. However, it is important to note that genetics alone cannot account for all differences in sexual orientation, as environmental factors (such as upbringing and socialization) can also play a role.

According to the Potential Genetic Basis of Homosexuality,studies of Identical