> is it genetic?

Like much in the field, this is something of an open question. You can fill literal libraries with material on this subject and still not get a clear cut, concise answer to this.

However if you honestly believe it is a choice, then I have to ask you when you decided what your sexuality would be. Because chosing your sexuality is an experiance I cannot relate to.

In my personal experience as a gay man it's not a choice. It may or not be genetic but it's definitely innate.

It's likely a mixture of genetics, hormones, and social factors. What's interesting to me is that homosexuality can be found in hundreds/thousands of animal species from high-order mammals to cephalopods. Whether or not being gay is a choice or is genetic or whatever else, it's clearly natural.

[1] - http://en.wikipedia.org/wiki/List_of_animals_displaying_homo...

Why does it matter?