I completely disagree with the father you quoted.
I did not choose to be gay, nor was I influenced to be this way. It involved no force, coercion, pleading, experimentation, molestation, or even being tempted with fabulous prizes.
People are simply born with their sexual orientation pre-wired in their brains. It's right in there among all the other congenital information, such as how to breathe, swallow, blink, think, operate muscles and joints, etc etc etc.
I've heard that some bisexuals claim that their same-sex attraction was the result of experimentation, which is fine and dandy for them. But there's no such fluidity where strict homosexuality and heterosexuality are concerned -- you're either one or the other, and it's there from birth.
But if your quoted father believes that he chose to be gay, then fine. He's entitled to his opinions and beliefs. But trust me, they are not shared by very many other people. What really matters is that both your parents are together, and that they love you. Speculations about nature are ultimately not that important. :-)