Yes, lube can go bad. Over time, the ingredients break down, and if the bottle has been opened and not stored properly, bacteria can grow. Using expired lube can lead to irritation, infections, or just a messy, ineffective experience. Always check the expiration date. If the smell is off, the texture has changed, or the color looks strange, throw it out. Your body deserves better, especially when it comes to something as sensitive as anal play. Clean, fresh lube is part of respectful service.