A lot of men just don't start their day without a cup of coffee. This beverage isn't just a great kickstart to the morning, because it's also full of healthy nutrients and antioxidants. On top of those benefits, some coffee lovers like how it gets the other end of their digestive system going. One particular study reported that almost one-third of all coffee drinkers wind up using the bathroom less than half an hour after having their first cup of coffee. This begs the question why does coffee make you poop?