In "How Choice and Emotion Can Influence Sexual Orientation," Ronald Pisaturo argues against biological and social determinism and for free will as the determiner of sexual orientation. He takes a position that bears some resemblance to an argument I've seen here before, one of Grim's, I think, that we express free will not always in the moment, but in habits. That is, there is no moment when someone makes a conscious decision to be homosexual or heterosexual, but that these orientations are the culminations of many decisions over many years.
It is particularly interesting to me because he argues that heterosexuality is also a choice (or, a long series of choices). In the past, I have simply assumed heterosexuality was the norm and there was no need for a choice, but Pisaturo's argument here intrigues me and I will have to think about it.
In any case, it is an argument I am highly susceptible to, so I invite anyone who is interested to read and poke holes in it, or say whatever else you'd like to say about it.