In my view I believe there is more than one reason, factor, and/ or genesis for the internal experience of homosexuality in a human body. Homosexuality arises in a variety of ways. Choosing to engage in sexual activity with a person of the same gender may be something that a person does with or without a homosexual orientation, by the way.
Homosexuality is a chain, a captivity and a separation from God, and a lack of full potential for the child of God. However, I do not orient homosexually, so I will also admit that I cannot speak from experience and I will allow others to speak their experience and I am willing to accept it from them. This is what I observe from the struggles of others, a few close to me, that homosexuality (or indulging in the drives of homosexuality or any unclean sexual drive) does not lead to inner peace.
Where the choice comes in, is how one chooses to handle their homosexuality. Most likely, the struggle was not chosen. There is so much struggle in this life we don't choose, at least not explicity. But we all have to deal. And enlightening our sexuality (not just homosexuality, but all of us) is just one struggle we ALL have. I don't know anyone who has sexuality figured out.
Sexual attraction is a complex psychobiological phenomenon. However, I do believe that gender is eternal. That is, I have always been and always will be female even in the cosmic aspect of myself. I also believe that the fusion of the male and female is also eternal. That is, males and females are to become One, including individual males and females, and including in the sexual realm, is the cosmic order. There are constant breakdowns in cosmic order in this mortal existence -- sexuality is not immune. The fact that homosexuality is a huge signal in mortality right now is an opportunity for us to learn more about sexuality and understand and experience its full potential.
By the way, just in general, may or may not apply to homosexuality -- just because something is not something that was chosen doesn't mean it is right. There are lots of things that people don't choose that are full of captivity (and therefore "wrong"). For example, genetic disposition to the disease of alcoholism; and being born into the Mafia. We still expect people to choose their way out of these situations into the right and the light (the struggle!). Why? In order to experience safety, freedom, peace and joy.