1: You have to have some type of attraction
2: That have to romantic feelings for you too
3: you have to put effort in a relationship
4: You can't be controling or a doormat
5: You can't date anyone your not attracted too
6: You gotta have sexually attraction or otherwise the girl will feel hurt you won't touch her.
I got more but those are the main ones. Tell me if I'm right. :D