Hygiene and Splatter Prevention: The cut-out gap allows users to wipe their genital area after using the toilet without their hand or toilet paper accidentally making contact with the seat surface.
Urine Splatter Reduction: It reduces the likelihood of urine striking the front rim of the seat during use, keeping the surface cleaner for the next person.
Plumbing Code Standards: In the United States, the International Plumbing Code (IPC) and Uniform Plumbing Code (UPC) require commercial and public restrooms to use open-front toilet seats to improve public health and sanitation.