Are you talking about car doors, or other doors?
If you are asking about car doors....It's because we are wimpy. We are wimpy in that we do not have the same upper body strength in the chest, shoulders, and arms as men do. Those are the muscles that you use when closing a car door. I have shut a car door many times only to have it not close properly. Solution: shut the door harder - with more force. Kids do the same thing. If the door doesn't close tightly the first time, you have to unlock the car and close it again.
On the other hand, when I have my arms full of grocery bags and shut the door with my hip, it usually closes tightly.![]()