*Going to the Bathroom During Class*

For some reason, students have absolutely no problem getting up in the middle of class to go to the bathroom. In America, we'd probably say that by that age, people should be mature enough to be able to wait unless it's an emergency. It surprises me every time. It seems rude. You have an hour-and-a-half class and ten people need to go the bathroom and it has to be during that time? Wow.