You may have noticed that the cushion in the public toilet is different from that in your home.
This is an abnormal phenomenon, which makes many people want to know what the gap in the front of the seat is and why it is shaped like the letter U.
The mirror reported that we should stop thinking, because the answer is like this.
The gap on the seat is entirely due to hygiene problems. They come from the United States, where they have specific plumbing guidelines to follow.
It is designed to give users more space to reduce your chances of touching the seat with your genitals and reduce the splashing of urine.

According to lynnesimnick, senior vice president of code development at the International Association of plumbing and machinery officials, the U-shape also aims to make it easier for women to wipe without touching the toilet.
Another advantage is that the production cost of seats is lower, and they are less likely to be stolen, because if someone comes to your home and you have a U-shaped seat instead of a complete doughnut, it will be very embarrassing.
California regulations stipulate that "all toilet seats, except those in residential units, shall be open front seats or equipped with automatic seat cover dispensers."
So next time you are in the bathroom of a bar, try to tell everyone the charming reason behind the mysterious U-shaped toilet seat, and you may get free drinks.