Of course engaging in any behavior is a choice. It's the attraction you have no control over.
Many men have attractions to women other than their wife but they don't act on it. As I previously said, everyone struggles with something, it's acting on that struggle that, regarding homosexuality, many have stopped doing. To repeat:
From everything I've studied on this issue, there is no such thing as a homosexual, just homosexual behavior, so engaging in homosexual behavior is a choice.
Well that would be cheating on their wives, so I hope they wouldn't. I'm in a long term relationship, and I don't cheat on my girlfriend either. It isn't sex that bothers me, it's the infidelity.
"As I previously said, everyone struggles with something, it's acting on that struggle that, regarding homosexuality, many have stopped doing."
They stop because they feel it is wrong. I do not think it is wrong, and therefore I see no reason to deprive myself of the relationship I'm in.