Can you like reversify someone's sexuality interests?
We are born with our sexual orientation (a proven fact) just as we are born with the colour of our eyes. Many try to change their eye colour with contacts but underneath they still have their same colour. This goes for sexual preferences as well. Some try to hide how they really feel but underneath it remains the same.
No. There are places that try but nothing has ever proven to work successfully.
People are who they are, they can supress it, get married, have kids, but it doesnt change who they are naturally attracted to... (assuming you're making gay people straight, I dont think anyone's too interested in the opposite)
I beleive you cant control or choose your sexuality.