Technically, not going in doesn’t count as coitus, but there is the possibility of infection. Clinically, it is required that coitus is prohibited 3 days before tubal lysis, and borderline sex is not recommended. This is because sex or borderline sex increases the risk of infection, and tubal lysis is an invasive operation that can easily lead to upstream infections, resulting in tubalitis, endometritis and pelvic inflammatory disease. Usually, tubal fluids should be performed within 3 to 7 days after menstruation, and before the evacuation surgery, leukorrhea routine, blood routine, infectious diseases, blood HCG and other tests should be performed. If vaginitis, pelvic inflammation and other gynecological inflammation or other diseases are found, tubal fluids can only be performed after treatment, in order to avoid upward infection. In addition, the possibility of pregnancy should be ruled out. Even if there is no ejaculation into the vagina, during the process of vulvar friction, a small amount of sperm-containing prostatic fluid may enter the vagina, which is prone to lead to the occurrence of ectopic pregnancy after the operation of the fluids in this case.