That's - kind of a complicated set of questions, DoDo. It could be you're bi. Or, it could be just some curiosity. The fact they happen randomly, and you're not thinking of a specific event or person, kind of speaks of just curiosity. Of course, I'm just going on personal experience. The thing is, every person is different, so you're experiences are unique to yourself. I think the main question is - and you have to be honest with yourself - how do you feel about it?
Honestly? That's perfectly normal. There comes a time in almost every man (or woman)'s life where they question their own sexuality. I don't think anyone is completely heterosexual, nor is anyone completely homosexual (I still feel some strange attraction to women sometimes... god those are strange feelings, haha). Really, you don't know for sure until you know... I can't explain it. You'll eventually just... know. There is no real way to "find out", unless you just... er, "try", but even that isn't necessary (I mean, I'm a virgin yet I know I'm gay). It could mean that you're bi, it could mean that you're pan, or it could mean that you're gay, but it also could mean nothing. There's really no way to know for sure.
Oi. Don't put yourself down. Your explanation was no less valuable. Just more concise and to the point. Furthermore, it raised an important question.
At one point in time I had the same thing happen to me. I thought all the same things you did. I chalked it up to just feeling different that day. After a while it turned into more and more frequent. The turning point was when I started noticing guys the same way I looked at girls. If there is no harm in the feelings felt. Its up to you to see how far they go.
To me, girls are just unattractive. They're also kind of scary and weird. And they're mean. No offense to any girls of course. :derpe:
Well since this thread exists I guess I'll post my thoughts on my own sexuality. It's actually really simple: I'm not afraid to admit that I'll love another man, as R says you love a person not a gender. However just because I'll love a man does not mean I'll be sexually attracted to one and could never see myself in a relationship of that sort.