Oh yes, I definitely went through that phase. And it lasted a little longer than I would care to admit. It's kind of embarrassing, actually. For instance, when I was in sixth grade, I got set-up with a girl. And the one thought in my mind was "Cool, guess I'm straight." (Yep, and that thought worked out really well...)
Of course, about a year and a half later, I found the wonder that is gay porn. I'd seen some straight porn before, but honestly it didn't do much for me. With gay porn however, I couldn't stop looking, and got a huge...."stiffy." Of course, me being raised to think that being gay was wrong, I made the decision that I couldn't be gay, and had to be straight. And so I said I was.....for a few years at least. I could rationalize my thoughts as "Well, he has a nice body, I want a body like that." Or "I just like the thought of getting a little affection from guys, and guys are so cool to hang out with." That doesn't really explain though why I kept wondering what guys looked like naked, does it?
My "oh crap" moment came (so to speak) when again, thanks to the magic of gay porn, I uh..... creamed myself, and it felt really really good. (I was a teenager, so please don't judge me! Please!
) However, I decided to rationalize within myself that I was "bisexual" to soften the blow. (Sorry, real bisexuals!) And that lasted longer than I will ever admit to, until I just said to myself "Who am I kidding? I'm just totally gay." And I kinda smack myself on the head for not being able to say I was gay much earlier, thusly saving myself from that ridiculous story I just told, which is unfortunately true. I think I've embarrassed myself enough for today.