I don't know about the research, but if there is a biological source in homosexuality, I can see the benefits of knowing more about it down the road. It will help social workers, educators, parents, and counsellors, etc., detect homosexuality in children at a young age so that they can treat them with the respect and dignity they deserve rather than mistakenly try to "fix" their behaviour. It will also help figure out certain interrelationships between these children and their peers, which will help with conflict resolution and other issues.
On the other hand, if homosexuality is partly (or wholly
) environmentally and socially formed, we can use this information to help those who aren't certain of their sexuality. Ideally, it would help us determine the real reasons behind our sexual activity. Sexual habits of any kind can be a result of trauma and abuse; I don't see why homosexuality has to be isolated from the rest. For the record, I don't believe homosexuality is a choice. But that's not to say homosexual desires cannot be triggered by certain events. Whether the experience or feelings are positive or negative depends on the individual context. Homosexuality in itself isn't negative (as these conservatives would have you believe), just as heterosexuality isn't in itself positive. It's the relationships formed around the parties who are involved in either that matter--and many of us know, relationships can very well be positive or negative.