Lack of evidence does not prove the opposite argument. I do not believe there is enough (any?) evidence at this point to say that homosexuality is a choice either.
Personally, I think for some it is a choice, for others it is genetic, or perhaps a hormone imbalance.
That's my thought also.
I don’t think it’s genetic, but I do think it has something to do with hormones from as early as in utero, possible.My cousin - one of seven kids - is lesbian and she’s exhibited a difference from her sisters from a very, very early age. (Like preschool age.)