You're asking about a gf and that's the only two options on the table? If what you mean is a girl you can just smack and go to the next girl, then that's not your gf, rather say hoe, a phrase that can exactly express the two of you. I mean, what happened to us? Aren't we concerned about personality even a little bit? I hope you don't get me wrong, we all have preferences regarding the physical appearances and body parts. But, these shouldn't be the only concern if we are looking for something that can last. Specially, if you are a teenager, what I just said now doesn't make a slightest sense to you, but I'm sure you'll appreciate this as you grow up in life(not just age)