Is it possible for one twin to be homosexual while the other isn't?

Human Sexuality; that would be Homosexuality (Attraction to the same-sex), Heterosexuality (Attraction to the Opposite-Sex) and Bisexuality (Attraction to Both Genders) has been proven to be inborn. This was done in a case study of Identical Twins, when both twins where born and one happened to be gay the other twin had a seventy percent chance of also being gay. Proving that Human Sexuality deals with Hormones in the womb, pre-birth.

Well Twins have a seventy percent chance of sharing the same sexuality, they also have a thirty percent chance of not sharing the same sexual orientation.

Epigenetics! Yes it is possible, and yes it may be indirectly genetic.

http://www.the-scientist.com/?articles.view/articl...

Currently scientists don't know why homosexuality occurs, though a new theory suggests that reactions to chemicals like androgen can turn genes on and off or produce other reactions that would make a kid homosexual.

There have been studies that show homosexuality does indeed run in genetic families.

Merp merp!

Yes. Just like out of 3 brothers i am the only gay one.

I once date a twin who had a straight brother - so yes.

Yes it's possible.

Yes it's possible I saw it in a documentary lol

Yes it is possible

yup, proving that homosexuality is NOT genetic.

any deviation from 100% would show that the sexual orientations of sexually divergent identical twins cannot be genetic

ACTUALLY its normal. Most twins are that way, look it up. one can be hung and the other not too.

I dont think it is possible