Since I'm at work, I'll have to be brief, but will try to expand on this later.
In about the 5th grade I became aware of sexuality. Like many young boys, I was first exposed to images of naked women in magazines like Playboy. As a teen, I became aware of the fact that the naked men in many pornographic magazines were as sensual to me as the women. By the time I was in my late teens I knew that I was at least partly gay but hadn't yet done anything to test the theory. In my early 20s I had my first gay experience and realized that this was pleasurable to me, as pleasurable as sex with women had been. The more I explored my sexuality (all in the name in research, mind you

), the more I accepted that I was mostly, but not totally, gay.
I'm convinced that sexuality is wired into the brain somehow. All we can do is either accept or ignore what's there.