You don’t absolutely have to do it, but I recommend it at some point in the conversation. It gives a woman a specific reason why you like her and why you’re there. Let’s say I’m out of town in a village, and there’s only one pub and only one chick who’s fuckable. Even if I don’t necessarily like her a whole lot, I can still find ways to honestly compliment her.
Catnap: “Hey, you’re the most decent chick in this place. I’m gonna have to bring you to my room tonight.”
Why should you compliment?