Girls are better at common sense because they think more about what they do instead of just doing it. On the other hand, boys just do it and I guess that gives them more courage to just go and do things. But to put more time into thinking, the fact is that you can get a lot of things done if you focus on one thing, get it done and move on. This is one reason that I think that girls have more common sense than boys. Boys like to goof off and girls like to calm down and chill.
For an example, you can be at school and get free time and all the boys would jump up and run around the room. The girls would just stay in their seat and think about it.