I was telling a story the other day at a dinner party, not meaning to start a political discussion. Anyway, when my son was three, my wife enrolled him in a class called something like Beginning Movement. When the time came for me to bring him to class, his third time, it was clear to me that he didn't want to go. I dragged him there (not literally) and watched as several young girls pranced happily about in pink dance outfits. My son was not enjoying himself. I asked him if he wanted to leave. There was no waffling with his answer - we bolted out of there and never returned. End of story.
Or so I thought. An openly gay man at the party was certain that my three year old was incapable of deciding for himself whether he liked to dance around with little girls. Rather, I had poisened his mind to the idea and my son was simply trying to please dad. He was certain that he was correct and brushed aside my opposing point of view.
Afterwords, as I mused over this discussion, I realized that what the man was saying was that environmental influences - ie my supposed bias against dancing - were the sole cause of my sons rejection of dance. In other words, he was not predisposed - ie born with - a distaste for dance.
Yet I have heard the same individual claim that one's sexual orientation is predetirmined. And this view is commonly held by gay people and woe to those who challenge them.
Anyway, I am by no means certain on the whole nature/nurture question though I strongly suspect that both play a role in our development. And that is a perfectly acceptable point of view, until it is applied to people who are gay.