I like to think that I'm a generous girl, happy to share whenever a friend is in need. In the past, roommates and I have had a communal hair dryer and a shared toothpaste tube — and we never had any territorial disputes over the shower caddy. And yet, if anyone were even to think about using my Clarisonic, I would hide that thing like Gollum. Nobody touches my Clarisonic! Whether you deal with roommates, family, or a partner, are you keen on sharing most things?