Not Clearly Pro or Con to the question "Is Sexual Orientation Determined at Birth?"
"Even when survivors identify as straight, they are not believed because of another homophobic myth that sexual abuse 'causes' homosexuality. There is no evidence that suggests abuse causes one's sexuality. Our sexuality is far too complex. If anything, we live in a society that tries to ensure that everyone is straight, and this perhaps more than anything else has a profound influence on how people identify their sexuality."
"Male-to-Male Child Sexual Abuse In the Context of Homophobia," Sexual Abuse: A Collection of Articles, 2001