It's pretty much the concensus among the psychology/psychiatry community, that having a gay experience does not make you a gay person. Many guys, and girls, experiment with friends of the same sex just because they want to know what it's like.

Keep in mind too, society conditions us to be "strait" or "gay". Just think of the ancient Romans or Greeks, they were totally casual about it and strait married men occasionally had sex with other men, just to do something different for the night. The whole taboo put on the subject is pretty arbitrary, it just doesn't really matter.

Personally, I've never had a gay experience, don't feel the need to. Albeit I'm a 22 year old virgin and still have that primal urge to have sex with a girl already, so first thing's first. If I suddenly did feel attracted to a guy, wanted to try it, then what the hell I'd go right ahead. I don't think I'd have any conflict about "am I gay? Am I bi? Am I just curious", I'd just fuckin' do it and find out. But thus far, cocks are a 100% turnoff.