Do you really believe there is "no way" of changing a gay person into a straight person? "No way" means that in all of human history, not one person has ever changed from gay to straight correct? What do you think the odds of that are?
I'll give you one such example. Her name is Rosaria Champagne Butterfield who spent more than a decade of her life as a leftist lesbian English professor specializing in queer theory at Syracuse University. She was in a committed homosexual relationship, served as the faculty advisor for a number of gay and lesbian student groups on campus, and co-authored the first successful domestic partnership policy at the university. Given her credentials, she would  probably be the last person you would expect to change from gay to straight; yet she changed.