“用水”是人们对清洗下身外阴部的俗称。每天晚上“用水”已成为绝大多数妇女的一种良好卫生习惯。因妇女经血、白带、尿液常会浸湿外阴,且外阴皱褶又多,故每晚清洗下身实为必要,杜绝了病菌的侵入。然而,男性却不以为然,大多数人没有“用水”的习惯。其实,男性 “Water ” is the common name for people to clean lower body genitals. Every night “water” has become a good hygiene practice for most women. Due to women’s menstrual blood, leucorrhea, urine often wet the vulva, and many extravaginal folds, so the lower body wash every night is necessary to eliminate the invasion of germs. However, men do not agree, most people do not have “water” habit. In fact, men