Labels are often black and white, imposing undesirable norms upon huge swaths of people to whom rigid conventions cannot and should not be applied. Labels do well, however, to simplify and clarify -- to provide boundaries and set expectations. Unlike the ambiguous term "hooking up," which can very well be used to reference everything from a three-second makeout session to full-blown sex, the "boyfriend/girlfriend" label universally implies exclusivity and commitment. But what about exclusivity itself? It's a little more than just hooking up, but not exactly full-blown dating. With absolutely no parameters beyond "don't hookup with anyone else," how do those in exclusive arrangements know what to expect from their... erm ... friend?  For instance, do you invite them to your holiday party? And, if so, how do you introduce them?  Hi, Boss. Meet SpongeBob, my friend with whom I am consistently physical but don't yet call my boyfriend because I'm not 100 percent convinced he's worth my time.  Do you turn down other dating prospects? Or perhaps, keep your options open without ever letting things with someone else accelerate beyond flirtatious conversation? But then, what if they do? Does that count as cheating?