1. Douche the vagina with medication in the absence of vaginal inflammation. There are pathogens residing in normal vagina forming normal microbiota such as Lactobacillus, Corynebacterium, non-hemolytic Streptococcus, Enterococcus, Staphylococcus epidermidis, Gardnerella, Escherichia coli, Peptococcus, Bacteroides, Mycoplasma and Pseudomonas. These bacteria form an ecological balance and do not develop when the resistance of the holy body is normal. 2. Washing underwear without a special basin. Washing underwear should be done separately in a special basin and changed once a day. If with other outer wear, there will be bacterial contamination. 3, wearing shoes to take off underwear. This is a very unhygienic bad habit, but there are people who do this, imagine how many bacteria and pathogens will stick to the bottom of your shoes. 4, do not wash your hands before you poo. The original jingle of hygiene is to wash your hands before and after meals, imagine what your hands have touched before going to the toilet, such as touching the money? In the bus with the handle? And so on, bacteria and viruses are everywhere, some people are infected with some infectious diseases, and even STDs, I do not know how the infection, good hygiene is very important. 5, before and after sex without vulva cleaning. 6, still have sex before and after menstruation.