''You are less pretty than..'' 

1) Why They Hate It: Woman hate being compared with someone else. Its stupid to say that the person you love is less beautiful than someone.She should be the most beautiful person you've ever seen.

2) Reason They Hate It: Woman care alot about who they look and what they wear, that's why every time you are asked ''Do I look good?'' its becouse your girl needs your support.She want to look good for you, so don't dare to screw things up!

3) How Will a Girl React If You Say It: The answer she will give you, won't be the most nice one you have heard. She will say something like ''Really? Than go date her''  and you might ever broke up if things got more serious.So watch what you say!!

4) What To Say: ''You are the pretties person on the whole panet!'' Make compliments to the person you tresure the most, so she can know how much you mean to her.