The gag reflex is the throat closing up and trying to force a foreign object down the throat. It is the body's attempt to stop choking by clearing the object out of the vital area.
It is called the "gag reflex." It is really one of the body's defense mechanisms to prevent foreign matter from entering the esophagus. You may have experienced this at the doctor's office when they...
This is a matter of becoming used to it and going slowly. Don't try to swallow the entire organ in one gulp or you will gag. Gradual insertion will help you to avoid gagging and increase the pleasure...