I think the function of zipper is equivalent to the button of clothes. In order to put it on, it is tailored to fit. Anyway, I opened my belt, pulled my underwear under my balls and let it erupt freely. At this time, there will be an inexplicable sense of gentleman heroism! After that, put on your underwear, straighten the hem of your shirt, then zip up, button up and tie your belt. Very comfortable! So the zipper exists for the convenience of putting on, taking off and cutting. Those zipper parties completely misunderstood the purpose of zippers, which led to the penis going astray every time. Personally, I think the process in the north is mostly to untie the belt, dig out the guy and release the water. Why? As a person who has experienced the northern winter. I know how many clothes to wear for my lower body in a cold place. Inside, trousers, thick wool trousers or cotton trousers. There is a pair of trousers outside. Some students asked, why do you still wear long pants when you have wool pants? That's because woolen pants itch when they touch the skin directly. Have you ever heard of Yu Qian's wool T underwear? Well, after wearing so much, if you don't know the belt, your dexterous hands will go through the openings in pants, long pants and underwear in turn to find Tintin. Very long. Especially the colder the weather, the easier it is for Tintin to shrink into a ball. It doesn't want to come out. I remember the first winter of college, a Fujian buddy told us pleasantly that it was cold and Ding Ding became short. So unbutton your belt and pull down a bunch of pants. Launch happily. According to my observation for many years, we can judge whether a person lived in the south or the north in childhood by going to the toilet. I took out my belt and lived in a place where I wore cotton trousers since I was a child. Pulled out with a zipper, there are basically no cotton trousers since childhood.