We all have our ideal. Our ideal is not everyone else's ideal and that's good because it means (hopefully) there will be someone for everyone - more or less. But don't say someone isn't beautiful because that's a generalisation I can't be done with.
Of course, it isn't always physical. Not all of us stop at the outer shell. We may profess to like the 'eye candy', but there's really nothing more tempting than an intellectual, someone who can hold a conversation or has something to say and knows who they are. There's no doubt this comes highest on the list. It's a much bigger turn on than the James Bond lookalike.
You can be the most beautiful person in the world and have nothing to say about anything. You can be an average Joe and have the mind of a goddess. I know which I'd prefer.