While I certainly don't believe anyone can freely shift gear with his/her sexual orientation but that doesn't mean there is absolutely no choice here. Yes, many gay people openly admitted that they failed at their attempts to live straight lives but your population here is biased. As you see, homosexuality is a very private and personal matter. Those who finally decided to openly embrace the lifestyle are certainly going to be vocal about it and those who are ashamed of it and tried to change are not likely going to speak up even if he/she succeeded in the end.