I answered your questions, now its your turn:
1. If they are born heterosexual (i.e. attracted to the opposite sex), why exactly would they choose to be homosexual?
2. If they choose to be homosexual (i.e. they choose to be with the same sex instead of feeling an attraction that is caused by their bodies/hormones etc) why do they need treatment if they can just choose note to be anymore?
3. Why would they choose to be homosexual if they are actually homosexual and they know that they would be persecuted, especially in certain countries?
1- I'm not a sexologists to know but according to human's nature logic homosexuals can't have babies which makes the relationship between male + male or female + female wrong mixture concept technically. Now to answer your question, sure there must be reasons, and this is why no one has found yet a pure concrete reason for being homosexual. But I am sure there are several reasons that are not connected to people born with genes.
2- This question is also related to question number 1, obviously feeling an attraction to the same sex has it's reasons, I know some homosexuals though wouldn't reveal what exactly they feel unless they sit down with another homosexual. The concept of treatment that I mentioned few pages back you guys either got it wrong or didn't want to understand it (even though some members are mocking the treatment thing but nevermind) what I think concerning a treatment is that there are things probably a homosexual hasn't seen/aware/know about the opposite sex. I tell you something, if I was living in a prison all my life with 100 men and 5 girls all my life I'd most probably sleep with men but if it happens that I'm out of prison why not someone consult me a sexologists or even physiological doctor that can probably make me see things differently. Give me a chance to look at things differently because people around you will never give you best advice and will never lead you to the right way. They think you wanna fuck men, ahhh it's fine it's his genes, they see you using drugs cocaine ahh it's fine he'll get over it let him enjoy his life. You always need the right people, but then again, each to his own... I know I would take my son if he was homosexual even if he had 1% chance of being heterosexual.
3- I believe that everything which is forbidden is desired by some. In these certain countries you're talking about no one is gonna come out and tell you I'm gay in public places. They have their ways, never a homosexual was caught or executed or even jailed although I can assure you there are PLENTY of them in some Arab and gulf countries if that's what you're referring to. They seem to have their small world which no one bothers them nor bothers to enter their world.