The main reasons for pain in the lower body during coitus are related to external injuries, inexperience in sex, and diseases of the reproductive system. 1. External injury: too much force during intercourse, whether male or female, may lead to lower body injury, and then the symptoms of lower body pain. 2. Insufficient sexual experience: if you don’t have enough foreplay during coitus, or if you are nervous or inexperienced in sex, you may also experience lower body pain. 3. Reproductive system diseases: the symptoms of lower body pain in men are mainly considered to be related to epididymitis, orchitis, prostatitis, glansitis and other diseases, which can lead to pain in the penis, testicles and other parts of the body. Male circumcision, pulled during intercourse, can also trigger pain in the lower body. For women, pain in the lower body is mainly related to vaginitis, cervicitis, vaginal polyps and other diseases. To sum up, there are many causes of pain in the lower part of the body during intercourse, and it may also be related to tumor diseases, etc. You should consult a doctor as soon as possible for examination, to clarify the causes, and then give targeted treatment.