I think as long as your iPhone is in your shirt pocket or sitting on a desk there is no need for a screen protector. The glass is pretty resistant to scratches. I don't use a a protector, but I also use a slide-in case. I know people who don't use a case or screen protector carry their iPhone in their pocket and the glass still looks great. I've also seen videos on YouTube where people shake up their iPhone in a bag full of keys, coins, and other "scary" items and the glass still looks great. Granted... this is YouTube so take it for what it's worth.
All that to say that I don't think you need a screen protector...
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