Oh MEEE!!!!
hehe. Girls are hot. Girls are beautiful. And this comments come from a gay dude. Many many times we classify ourselves as "gay" however most of us have some straight fantasies too. Most people are bi, you know?
As well as many many kids have a "gay" phase before puberty, we do have some straight phases too. Or at least I have ( T.M.I LOL ) and it is absolutely normal for him to be curious about sex, either normal heterosexual to hardcore gay. I mean, he was the most virginal (inexperienced?

) of all.
No, not all gay people are interested or curious about girls. Perhaps he is as well still trying to figure out who he is. Perhaps he just wanted to know what happens - LIVE! At the end, movies =/= reality.
I think I have covered up this well from a gay point of view.

-Jean