It is impossible to get pregnant from oral sex because the ejaculated sperm enters the gastrointestinal tract and is destroyed by stomach acid, so there is no way to combine with the egg and clinically it is impossible to get pregnant. However, it is recommended to quit the habit of oral sex because the mouth contains a lot of bacteria, which may cause glansitis, prepuce, and even herpes infection in the genitals of men. In addition, some people have oral sex followed by vaginal sex, which can bring bacteria into the vagina and cause vaginal inflammation, cervical inflammation, and even pelvic inflammation, often resulting in frequent lower abdominal pain in women.