The red spots on the glans immediately after intercourse may be caused by overstimulation, infection and allergy. 1. Excessive stimulation: during sex, too much time or improper posture, excessive stimulation of the glans area, will make the glans appear red spots, may also be accompanied by mild pain, reasonable rest can be improved on their own. 2. Infection factors: women have vaginitis, do not take protective measures during sex, after sex may make the glans infected, will make the glans appear red spots, accompanied by itching, tingling and other symptoms. 3. Allergic factors: during sex, men use poor quality condoms, which may cause allergic reactions in the glans area, which will make the glans appear red spots immediately, accompanied by intense itching. After intercourse, red spots appear on the glans immediately, and there are other abnormal manifestations, you should promptly consult a doctor for examination and treatment.