Extracorporeal ejaculation may lead to hepatitis B infection. In cases where the woman has not been vaccinated against the hepatitis B virus and there are no antibodies to the hepatitis B virus present, sexual intercourse, even if the man ejaculates outside the body, may result in the transmission of the hepatitis B virus through a small amount of bodily fluids, as well as prostate fluids, leading to the woman becoming infected with the hepatitis B virus. Therefore, during sex, both men and women need to wear condoms if one of them is a hepatitis B patient. If one partner is a hepatitis B patient, it is recommended that the other partner needs to be vaccinated against hepatitis B. This is the best way to prevent the hepatitis B virus. Although the hepatitis B virus can be transmitted through eating or even kissing, it can be transmitted through sperm, semen and prostate fluid in men and vaginal secretions in women. Hepatitis B is a relatively dangerous disease, so it is recommended that patients need to actively seek treatment.