"Identical twins sometimes have different orientations. For example, one may be straight while the other is gay. How can that be? In a study where scientists looked at the sexual arousal patterns of identical twins with different sexualities, they found that gay twins demonstrated more genital arousal in response to same-sex images, whereas straight twins demonstrated more arousal in response to opposite-sex images."
"The field of epigenetics tells us that our genes interact with our environment, and that the environment is capable of turning specific genes on or off. In theory, this means two people could carry genes linked to same-sex attraction, but both wouldn't necessarily be gay depending on certain environmental factors."
Research indicates that sexual orientation has a genetic basis, yet identical twins can exhibit different sexual orientations. Studies show that identical twins with differing orientations display distinct arousal patterns to same-sex and opposite-sex stimuli. This suggests that while they share the same genes, their attractions differ. Epigenetics may play a role, as it involves gene-environment interactions that can influence sexual orientation. Prenatal hormone exposure is also considered a significant factor in understanding these differences among identical twins.
Read at Psychology Today
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