The red glans after intercourse may be caused by friction, but also may be caused by allergy, circumcision and glansitis. 1. Friction: friction caused by the glans red after intercourse may be in the same room, due to the penis speed activities too fast, resulting in increased friction of the glans, thus causing the glans red after intercourse, is generally a normal phenomenon, the symptoms will be relieved after rest. 2. Allergy: allergy may be in the coitus, female vaginal secretion of substances leading to glans allergy, thus causing red glans after coitus, generally in the cleaning penis will be relieved, if not relieved can be by following the doctor’s instructions oral loratadine capsules for anti-allergy treatment. 3. glans phimosis: glans phimosis may be caused by bacterial infection, when the inflammation stimulates the glans will appear after intercourse glans phimosis, generally through the prescription of oral amoxicillin capsule, erythromycin capsule, cloxacin capsule antibacterial anti-inflammatory, the symptom suffers from the alleviation of the situation. The red glans after intercourse can also be seen in other causes, it is recommended to consult a doctor to confirm the diagnosis and then treatment. It is necessary to pay attention to the side effects and adverse reactions of drugs, please use under the guidance of a doctor.