Unclean sex includes the following three aspects: unclean sex means unclean and high-risk two mean, the following kinds of belong to unclean sex: First, no cleaning before sex, do not pay attention to personal hygiene, will increase the risk of gynecological disease. Second, without a condom, anal sex and other high-risk sexual behavior, because there is contact with bodily fluids and the possibility of bleeding, will increase the chances of infection of STDs on both sides, with mouth ulcers when the mouth also belongs to the high-risk. Third, group sex, exchange, etc. There is an exchange of bodily fluids between different people, the chances of disease in this case to be even greater. So unclean sexual behavior is mainly two aspects, one is not pay attention to hygiene, the second is to have high-risk behavior.