The penis can not be pulled out after intercourse is mainly caused by vaginal spasm. During intercourse, if a woman has vaginal spasms, the muscles outside the vaginal opening will spasm or contract on their own, which may result in the penis not being able to be pulled out after insertion; at this time, sexual intercourse should be stopped, and wait until the vagina is relaxed or the penis is weak, and then pull the penis out. Vaginal spasm is mainly caused by gynecological diseases, drug stimulation, psychological factors, vaginal dryness, incorrect position and other factors; before intercourse should ensure good health, stop taking drugs that affect sex life; both sides to maintain a relaxed and happy mood, to avoid mental overstress; to do enough sexual foreplay, so that the vagina is wet enough; intercourse to choose both sides to accept the position, to avoid damage to the penis or vagina. If the symptoms of vaginal spasm cannot be relieved during intercourse, it is recommended to stop having sex and go to a regular hospital for treatment under the guidance of a doctor.