Im only saying lie occasionaly, but the ass grabbing works to get you out of the "friend zone" it makes her think of you as a guy not some friend, it tells her that you interested in more than just being friends, but subtlely, and its not even close to the first thing you do, you gotta work up to it. But to the lying, it keeps the conversation going to, thats an important part, your want to be interesting.