Several times over the past couple weeks, I’ve ridden the subway with a couple that kisses very loudly while they ride the train to work. I’ve had to stand next to them, inches away, while they “smack,” “smack,” “smack”-ed each other’s lips over and over again. They must have kissed 15 times in the time the train traveled one stop. This morning, I just about had it. I was so close to telling the kissing couple they were being inconsiderate and making others uncomfortable—I can even hear the sound of them kissing when I’m listening to my iPod. I held back, though I’m not sure I can much longer. From now on, I will be getting into a different car if I see them hopping on the subway with me. After the jump, what’s not allowed when it comes to PDA.

With all the hullabaloo over Barack and Michelle Obama’s much watched fist-bump on Tuesday, we started thinking about how it compared to other political public displays of affection. Who could forget the never-ending kiss at the Democratic National Convention between Al and Tipper Gore? Some people are still holding back their lunch. Republican Presidential nominee John McCain has a PDA pattern of his own—at every rally he make sure to thank wife, Cindy, then gives her a polite kiss on the cheek. For others, as well as another photo of that fist-bump (we couldn’t resist), click after the jump…