I think it's as accurate as an internet quiz can be. I am very, very straight. Even more straight than I would like to be. I'm very secure in my sexuality, and very sure that I don't enjoy sexual relationships with men.
Through the faculty of imagination? I can imagine myself making out with a guy, and I don't like it. It doesn't feel right; in fact, it feels very wrong. Not wrong in a moral sense, of course, but wrong in an uncomfortable way.