Twenty years ago, Greg Quinlan was living as a homosexual and was a homosexual-rights grassroots lobbyist. He had no doubt he was born homosexual. Advocacy groups like the Human Rights Campaign, for which Quinlan worked, claim that homosexuals have the right to marry and adopt children. These rights are presumably based on the idea that sexual orientation cannot be changed.“To whom one is drawn is a fundamental aspect of who we are,” proclaims the Human Rights Campaign website.Yet, scientific, medical and professional groups increasingly acknowledge that the notion that same-sex attraction is inborn and unchangeable does not hold water.“Heretofore, no...