"There wasn't. I have asked that repeatedly. And asked his twin. He knew he felt different from a young age."
In cases like that, self-reporting simply cannot be considered conclusive.
In addition, there are lots and lots of people who feel "different" from a young age who don't develop SSAD.
I understand your difficulty with this. The whole situation challenged everything I had believed about homosexuality. I have a few gay friends who alway say they were born that way, but I had never had anyone so close to me that I could have deep difficult discussions with. I know in my soul he did not choose to be gay. However, I still feel that some choose and I feel abuse is a factor in some. I believe there are many factors which can come into play, that sexuality is not as simple as I once believed.
This man's parents will not even allow him to enter their home. He has not had Christmas or Thanksgiving with them for at least 5 years. I have seen him wailing in pain at this. They think he can choose not to be gay and until he does, they will have nothing to do with him. If he could, he would do so to regain his parents' love; he has told me that.
He does not date; he is avoiding his sexuality at all costs so that maybe they will accept him. But his parents want him to have a girlfriend. That is "proof" to them that he has changed and he says he cannot do that to a girl--he cannot use her simply to perpetuate a myth.
Seeing this so close to me has affected me deeply.