I gave up on the idea that my car would go undented a long time. Shoot, my ex dented my car about three months after I bought it. He opened his door wide so I could see into this rental car.
For the longest time, that was the only dent I had. I noticed another one on the passenger side. That one doesn't bother me since I don't have to look at it.
Generally, I try to park where one side of the car is next to a wall or something immovable. I usually back into the spot so if it gets dented, it'll be on the passenger side and I won't see it.