Beauty is only skin deep. If you go after someone just because she's beautiful but don't have anything to talk about, it's going to get boring fast. You want to look beyond the surface and see if you can have fun or if you have anything in common with this person.
I'm such a believer in 'if you're beautiful on the inside it really shows on the outside.' I know a lot of people who are physically very beautiful, but their inside doesn't represent that. So to me, it just doesn't come across as having a sparkle to them or an energy that just radiates.