Well, yeah, the spectrum certainly exists, but almost all of us fall hard to one side or the other.

I've heard it described as a bimodal distribution. Bisexuality seems pretty common though. Statistics say it's more common for women to identify as bisexual than lesbian. The majority of women I've dated have been bisexual, but with a preference for men. Most non-straight men I've known have been fully homosexual. Personally, I'm straight. I've always had a hard time trying to figure out what a conventionally attractive man was (mostly to make myself more attractive), and still sometimes get surprised when someone describes a particular man as attractive. I find most women physically attractive, at least in certain ways (though I have certain preferences, of course). Personality seems to be what makes or breaks the attraction for me.