When is being gay being gay?

So we had this conversation at work last week, I could not stop thinking about it all weekend. I have not been able to get a definitive answer from anyone. The question is "When is being Gay being Gay?" When someone is "experimenting" is it possible that they are not gay but just confused. This came up from a show i saw over the weekend. It was a rerun of an MTV show True Life (sorry couldn't find video). It focused on this guy that was claiming that he was heterosexual and yet he does gay porn as a living.

Is this even possible? I come to wonder. i personally do not agree at all. You have sex with someone of the same sex you are no longer heterosexual. Either your in between or your gay. I feel this as cut and dry. Even if your raped. Let's use a man as an example. He goes to jail and is raped. His manhood is now obsolete gone. He was not a willing addition to the display but it was none the less done. In this aspect if he keeps it to himself and doesn't tell his family and friends is he Gay? I think that he might not be he just needs to keep it to himself. He tells his family and friends he will never be viewed the same ever again. What about a girl who likes and sleeps with both men and women. She is not sure what she wants but claims she is not gay shes just confused. Does this mean that she is gay? Once again i think that she is gay.What do you think of this?

As always Sweet water and light laughter, till next time we meet,
Azi