Could be, doesn't matter to me one way or the other. When someone insists on something very specific like the existence of a particular gene accounting for the 'condition,' it is incumbent upon that person to provide support for such an assertion, that's all.
It would seem plausible, given how difficult - and perilous - it has been at certain points in history to be so oriented, that it is an aspect of a person's makeup that they cannot change. However, when you hear about 40 - 50 year-old men and women leaving their marriages because they suddenly came to the realization that they are gay, you have to wonder. Were they 'pretending' for 50 years? Were they somehow suppressing a gene all their lives? Is it a gene that didn't 'kick-in' for them until so late in life? It is at least fair to say there are many questions. Whatever the answers, it still holds that whether or how gays are accepted in society is a social matter and only tangentially a scientific one.
Yes, they were pretending. .
You know that to be the case for every single member of what must be a reasonably large group of people, at least nearly all of whom you don't know personally? You have unimpeachable insight into their inner thoughts and feelings? I can understand if you feel strongly about this topic, but try to adhere to at least a basic level of logical consistency.
How often does it really happen? Whenever it does it seems to make national news, that implies to me that it is not common. You seem to wish to pick a fight instead of having a civil discussion, you make the same type statements without backup as well, be consistent or go home.