Not possible....
Think about it.
Since we know that homosexuality isn't innate, i.e. people aren't born gay. Rather, it's a lifestyle choice. A given person is turned gay by the experiences he or she has growing up...bad experiences with the opposite sex, creepy uncle, older kids who are their 'special friend', ect... Siamese twins would have nearly the same experiences, so it would be impossible to have a gay/straight set of siamese twins. They'd either be gay/gay or straight/straight.

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