5 reasons you need to stop leaving the toilet seat up Do you leave the toilet seat up when you flush? A simple question – maybe one you’ve never really thought about before, or maybe it’s your biggest peeve when others do it. Whatever your answer, it’s a very valid question. Because this seemingly benign habit may be the source of a fountain of bacteria erupting in the middle of your home. Would you stick your head inside your toilet? No, probably not. But flushing with the lid up might...