In identical twins, there is about a 20% chance that if one twin is gay, the other will be gay as well.
If genetic change was responsible for homosexuality, then you would expect a much higher % would you not ??
Scientists have not come out(pardon the pun) and unequivocally stated that genes do not cause homosexuality because there is still much more research needs to be done into the field.
All the research done up till now strongly suggests that homosexuality is not genetic.
