Everyone knows how to flirt. Just kidding, that's not true at all. In fact, very few people know how to flirt and make it where it actually works. But we are always trying, even though we have no idea what we are doing. And this change in behavior, while it doesn't ever get perfected, is what makes flirting funny. Check out how flirting changes over the years and be thankful, if you don't have to do it anymore.