Ultimately, its best not to commit to a relationship with someone until you feel attracted to the person completely. That said, its totally OK to date and see if connection and physical chemistry grow. It means something; you need to feel interested enough to want to read on.
Can you date someone you find unattractive?
Its perfectly fine if you want to date/sleep with someone just because theyre ridiculously good-looking. Sometimes dating an unattractive person will make you realize that having a partner who physically turns your crank is vitally important to you.
Can you find someone more attractive over time?
Can attraction grow over time? Well, in short – yes, absolutely. But that doesnt mean its always in the romantic sense. See, for most people, theres more to attraction than just physical appearance.