clean watercloset / watercloset

women as distingguished from men,they sit on the watercloset when they are pissing.but when men are pissing,their urine usually leave on the edge of the watercloset.the "clean watercloset" has a foot plate.when men need to take a piss,they only need to tread the foot plate,the baffer on the watercloset rolled up.and for the same reason,when women tread the foot,the baffer rolled down.they don't need to bend their back to turn the baffer over.