Getting too deep may invoke gag reflex which is absolute normal. Gag reflex is a protective reflex in humans that prevents the passage of anything from the throat, except during normal swallowing. Since he does not bother, you may also rethink and discuss the problem with him over again. You may need to modify things a bit if it is uncomfortable for you.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.