I'm smarter than a lot of people around here in that I don't want a relationship for sex only. That's really superficial and that means that her looks and body are everything everything everything! But she has a brain, soul and spirit and I look at those too. I told my classmates male and female alike that "an ugly personality ruins a pretty face." There's a real person in there, and a relationship would provide something better than an average "Best friend."
That doesn't mean I never think about sex, though. If she wants it then she's probably gonna get it.
Then go ahead mate. Talk with her parents and ask for their permission so you can court this girl. I suggest you put on a suit, buy flowers and knock on the door. When she goes to receive you (and don't tell her what you are going to do, it has to be a surprise!) tell her you are there to have a serious conversation with her dad. You go to the living room and tell him "Sir, I think you are missunderstanding my intentions. I'm a real person, not like those other guys, I LOVE, yes love, your daughter because she has a brain, soul and spirit as beutiful as the moon and the stars. You must understand I'm not after sex, at least until we take our vows before God Almighty, I want to take care of "insert girl's name here" and show her how much of a real person I am. Therefore I ask for your permission to court her" Here you give the flowers to the mother and say "M'am" as you make a little reverence.
She's yours now mate, just follow my advice.