As that geneticist said when being interviewed and was asked why he specialised in his subject matter "I have a dream."
The reporter turned a little snarky on it and was all "What, cure cancer, feed world hunger?"
The geneticist replied "No. A redhead. 5'7. 36-24-36 and with legs up to...."
But seriously, yes, physical attraction is nice, but it's not going to kick off beyond aesthetic appreciation if you can't enjoy yourself in the company of whoever your with. The person who you can just relax and BE when you're together. The ones who can get your personal crazy, and accept it happily without trying to change it. Hell, if you can't laugh together during sex, what's going to be the point of it in the long run? And frankly, whether your minds mesh and your chemistry clicks can vary wildly on so many small things.