Do gays have a higher rate of having sexual abuse and molestation in there childhood and is there any factual evidence supporting that is the reason they're gay in the first place?

I find this very hard to believe that having sexual abuse in your childhood contributes to anda being gay. Just because a child experiences these things shouldn't connect it to being gay. I also know that being gay is not a choice and there is hard evidence supporting the fact that it happens before birth. I just want the stats on this and see the numbers.. My rational conclusion is that it's complete fiction, but I like to have the facts none the less.