Alrighty. For reference I'm a white male, heterosexual bi-romantic and had a period of bi-experimentation
Do you have more friends of the same sex, or of the opposite sex?
I have more friends of the opposite sex to me, and I always have. For some reason I have never been a position where the men I interact with are on the same wavelength as me, but the women often are.
By wavelength I mean interests/hobbies/likes and dislikes. I'm a writer, a comic book and videogame nerd, and I like Sci-Fi and Fantasy. Most of the men I've met have been big into sports like football (which I hate) and generally very stereotypically male. They organise into packs, they have Alphas and Beta males, the weaker members of the pack all seek approval from the stronger males. Not to say that the women surrounding me haven't also been what may be viewed as traditionally female, but of the people I've been around, it has always been more likely that there will be more women on the outlying edges of the social group than men.
This so far includes (Boarding) High School, University and my current job. The only men I've found not fitting this pattern are a couple of guys I've met at open mic nights, but even then, it's only one or two guys vs half a dozen girls.
Do you have more heterosexual friends, or more non-heterosexual friends?
This one's kind of tricky. I have more close heterosexual friends than non-heterosexual friends. But I've spent nearly five years now playing regularly in gay-friendly bars and pubs. So naturally I have met a lot of gay/lesbian/bisexual/transgender/transvestite folks, and since it's easier to make friends when you share some sort of history/understanding, and I've spent my life on the edges of society with confused sexuality issues, you tend to make friends, though not as close because I don't really share much else in common with most of them.
(blimey five years is a long time, I didn't even notice til I stopped to think about it for this question)
Do you have more friends with the same skin tone as you, or different skin tone?
Almost all of my friends are white as the driven snow, like me. Partly this is to do with where I've lived, since there are very few ethnic minorities in Norfolk, Lancaster or Belfast, but it definitely comes back to the previous two points. I've yet to meet a single non-British Caucasian person who was any sort of outsider/nerd/geek/loner. My ideal friend shares my interests, and I have never met a single person who wasn't white who did. Obviously some of this is to do with not being terribly social outside of work, but even when I have gone to writing groups/videogaming parties/open mic nights I very rarely even see non-whites, let alone have a chance to have a heart to heart with them about their personalities.