I have to disagree with you, Crimson, at least personally. Sexual chemistry and attraction are not what I base the beginning of a relationship on. I base it on intelligence, how they carry and portray themselves, and many other things first. I also do not base "attractive" on physical looks. The media has us so screwed up on that anyway.
Not talking to people because you are not attracted to them kindof makes you shallow, I think. I'll talk to anyone, doesn't matter what they look like because they are people. Have you seen "Shallow Hal" btw?
It's the insides of people that count, the outside is just a package.
And what the hell does sex have to do with anything working or not? If you're basing a relationship, any kind of relationship, on sex..it is bound to fail. There is so much more than that.