The argument some of you are using, that homosexuals do indeed choose, is rubbish. I'll explain:
The realisation of one's sexual orientation is once again, another chemical factor. Firstly, you must know what puberty essentially is to understand what I'm going to explain. In understandable terms, puberty is the period in which our bodies and minds are altered through the excited release of hormones. Things such as height, weight, whether pimples will appear (etc) are all results of chemicals, specifically, the encoded data in DNA. Sexual orientation is just one more factor, exactly like height.
During puberty, this data is accessed, and the necessary changes take place. You start to grow more, you might grow pubic hair, or you might not. Along with these, the brain changes, in relation to this topic, 10% of the population realise that they are homosexual.
That is why the majority of homosexuals, bisexuals, transgenders (etc) are 'awoken' to it. The reason most humans play 'lovingly', and appear to have a 'loving' relationship with the opposite sex during the pre-pubescent years, is simply society's impact on our perception of the world. Children grow up in the mindset that they are only to be attracted to the same sex, and as children, we're too young to know any better - we act as if we are in love with females because it's on TV, because our parents are that way, because our friends' parents are that way.
I also find this to be very interesting, and from what I've read of it, I've heard the same arguments in proper publications:
http://www.bidstrup.com/phobiahistory.htm
Alcar...