Maybe jumping into this one a little late... but it's something I have a bit of experience with myself, so I figured I'd ring in. I've fallen for two people I considered to be good/best friends at the time, and I have many friends - gay and straight - who have as well. I think it's probably really common.
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-Do you think people (straight or gay) are prone to falling in love with their best friend? Or is this just over-represented in the forum.
Agree with others - it happens a lot, because we tend to want a lot of the same things from love as from friendship. Minus the sex, usually (though there are exceptions there too). But most people are attracted to similar qualities in friends and lovers - good conversation, shared interests, trust, that feeling of being around someone who "gets" you and understands you and makes you happy to just be with. So yeah, I think it's not much of a stretch at all to get from friendship to love. Also, just by being around someone as often as you tend to be around your best friend, the feelings of being comfortable together and sharing experiences can just naturally develop.
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-Do you think GLBT people are more likely to experience this than straight people?
From what I've seen, maybe that's true, just because when we're young, we're more liable to have best friends who are the same gender as us. But it can certainly happen to straight people with best friends of the opposite sex too - trust me on this one.

And this may be a bad stereotype but from my experience, I think it's probably more common for girls to fall for their best friends - male or female. The bad stereotype is, of course, the notion that women are more attracted to inner qualities and less to the exterior package as it were. I can't say that's true of all women, or that men are all shallow, because I definitely know a lot of exceptions to those rules. But as with most stereotypes, there is
some truth to it.
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-Has it happened to you or someone you know?
Yes. *Sigh*. I have a really bad habit of it actually. The first guy I ever fell in love with was my best friend for over two years before it turned into more. A couple of years later, I did it again and fell for another guy who was a good friend first. Actually I think it's a bit of an annoying pattern with me; I tend to need to be "friends first" before I really fall for a guy.
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-Why do you think it happens in general?
Pretty much for the reasons already listed. You love someone as a friend for a lot of the same reasons that you fall in love. You have things in common, you get one another, you like each other's company, you're on the same wavelength, etc.
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-Overall is it a good thing or a bad thing, and why?
My track record isn't too good, unfortunately. Good while it lasts - great actually - but then when you break up, you lose the love
and the friendship. Double-whammy. But I still have this romantic notion that the guy I eventually end up with will be my both best friend and my lover. I've seen it work out with other couples, gay and straight, so I figure it's possible. But it's a big risk, because sometimes losing the friendship is harder than losing the relationship, after things go sour.
Overall I'd say it's a big risk. Then again, life's a risk. So is love. You never know until you try, right?