To me, it's a curiosity, partly because I'm a gay guy and partly because sexual orientation isn't something that's outwardly obvious. The anonymity of an internet poll is the perfect place to find out.
I know we could poll the hell out of the community and drill down to all kinds of details, but the one thing I've never, ever heard anybody discuss is the distribution of sexual orientations in tech, or at least as is represented by the HN userbase.