Haha, the answers from the two upstairs are very interesting. To tell you the truth, when you sit on the ground, or sit on a stool with mud or stones, you will know. Stand up and pat the dirt on your pants behind your ass. This is normal. Have you ever been to the countryside? Have you seen it? Men also shoot. Of course, it doesn't matter if you don't pay attention to hygiene At that time, according to your supplement: no dust, no dirty pants, this is the leveling of clothes, for fear that pants, especially buttocks, will wrinkle, or someone has developed a habit.