I've had mine 6 days. It's been in my front pocket the whole time. No bends. Also, owned a 5 that was in my pocket for 2 years without bending. If people are putting it in their back pocket and sitting on it, they should expect it, or anything else they put back there for that matter, to bend.
Apple's fan base is such a double-edged sword. They are totally loyal and flock to their new products like a moth to a light...then they put everything under a microscope and piss and moan about the littlest ****. "I saw this video on the Internet of a guy forcefully bending a new iPhone using as much force as he could muster. It's a defective product. Whaaaaaaaaaaaaa." It's ridiculous sometimes. Every time I'm due for an upgrade I contemplate switching to Android just so I'm not put into the same category as all the whiny fanboys.
You should complain to Apple that it hasn't bent.