What happens to a couple when one of them discovers a new kink that he's not sure his partner will be into? Dear Art, I'm sure you get messages like this all the time, but I feel like I don't even know who I am anymore. I suppose I should start from the beginning... Three weeks ago, I saw puppy play for the first time, and now I can't stop thinking about it. Wait, no, that's not really the beginning... Ten years ago, my best friend who I'd...