False question. The real question is HOW are girls? And the answer varies. Sometimes well. Sometimes sick. Sometimes hot, sometimes cold depending on the weather. Sometimes girls are happy and they're just as often sad.
The important thing to remember is that girls are just like you and me. Don't be afraid of them. Show them the same respect you'd show your best mate, or your mother who -- believe it or not -- is a girl! Remember that girls are people and girls will treat you like people, too!