I'm new to iphones - my first one (5s 32MB) comes in on Wednesday (9/25). I've had several android phones and never a case on them and never really had any issues. One does have a dent on it near the screen though. Anyway - is it safe to go nude on the phone? My wife's got a case on her 5 and her 4 before it but I'm not 100% sure I want one. Thoughts - suggestions?