I get the sense that some people confuse sexuality with romantic attraction.
I believe I - and anyone, for that matter - can have a romantic attraction to anyone. But I also believe that sexuality is important, because I believe, in a relationship, sharing each other sexually is important, so sexuality is important to me. We are a sexually driven society, so most of us close ourselves off to the notion of falling in love with anyone but the people we are sexually attracted to. I don't think there's anything wrong with that, but it still is something that I don't think should be happening.
I think both sexes are attractive, but I've only ever been sexually attracted to women. Though I'm not at all closed off to the idea of having a sexual encounter with a man, it isn't something I can see myself doing.