You hug your friend. You kiss your friend on the cheek. You plop a big, wet kiss on your friend's mouth. Wait, what was that last one? Kissing one's friends isn't as uncommon as you might think. Many ...

Editor’s Note: Jill Filipovic is a journalist based in New York and author of the book “OK Boomer, Let’s Talk: How My Generation Got Left Behind.” Follow her on Twitter. The opinions expressed in this ...