It's usually a combination of free will, sexual orientation and religion. It's been frustrating me a lot of late at work as we have these debates everyday. There's one colleague of mine who makes it impossible for anyone to share their opinion because "they're wrong", and then declares what he's said as "it's just my opinion! Your opinion was wrong and all, but mine was right and you can't argue with me!" Today, he said that being gay is a defect AND a choice within the same sentence. It's not the same thing at all, and he didn't realise what a **** he was making himself out to be.