Medical couplers for vaginal ultrasound generally do not affect coitus. Medical coupling agent is a medical product composed of a new generation of water-based polymer gel, its pH value is neutral, non-toxic and harmless to the human body. It is not easy to dry, not easy to rancidity, easy to decompose. There are some medical couplers on the market that also have the function of sterilization and disinfection. Therefore, its generally does not affect coitus. There are many factors affecting normal coitus, including frequent sex, mental anxiety, bacterial infections, etc. Patients should be observed in time. In addition, such as coital discomfort, it is recommended to go to the hospital in a timely manner, do the relevant examination, clear the cause of the disease and then follow the doctor’s instructions for treatment, to avoid delaying the condition.