I use to have this issue and now I can deep throat so my best advice is..dont think about what you are doing!Also find a position you are comfortable in.I find myself gagging if im on the floor and he is standing infront of me..the only way i really like is leaning over top of him(best for deep throating as well).seriously though get in good position and dont think about what you are doing just go with it and if you have a hard time not thinking about it have him finger you or use a toy on you..that should put your mind else where!..Hope this helps!