First time sex precautions can include before, during and after sex: a. Before sex: 1, knowledge preparation: should be fully understand the physiological knowledge before sex; 2, clean preparation: before sex should pay attention to keep both sides of the vulva clean, to avoid cross infection. If the woman in the menstrual period, not to have sex, so as not to cause infection; 3, contraceptive measures: if there is no birth plan in the short term, should pay attention to take safe and reliable contraceptive measures, such as condoms; 4, psychological preparation: both sides should pay attention to avoid tension before sex, relaxed mood. Second, during sex: pay attention to mutual cooperation, the action should not be overly violent, so as not to cause damage to women. Third, after sex: after sex should pay attention to good cleanliness and hygiene, women may have hymen rupture bleeding, can use pads or sanitary napkins to avoid blood leakage, at the same time should pay attention to diligent change of underwear to avoid infection, if the bleeding continues more than, can go to the hospital to check whether there is a vaginal tear, timely treatment treatment. Men should also wash the area in time after sex to avoid bacterial infection. Men may experience early ejaculation and sexual failure during first time sex, which should be treated correctly and may be due to lack of sexual knowledge or over excitement. The chances of successful sexual life can be improved by supplementing sexual knowledge and after a certain period of adaptation. In addition, it is recommended to fix sexual partners to avoid multiple sexual partners bringing about sexually transmitted diseases as well as gynecological diseases.