"Now, while there are many ways to give a blow job and many ways to have one given to you, there is no doubt that deep throat is something that takes practice. The gag reflex is not something to be underestimated and once a woman starts to gag, she’ll often stop what she’s doing and focus on something safer. If you want to be able to deep throat your affair partner, it might take a little practice. I would suggest getting a toy or something that is close to the size that your partner is when erect. You might even want to start with smaller dildos and work your way up.
One thing that I can’t stress enough is that you shouldn’t try to deep throat a banana or any food stuff. There is a choking hazard as a banana will break into pieces and get stuck in your throat. Instead, use a sex toy since you are able then to practice without fear of it breaking apart and choking you."
For tips and advice on deepthroating see Ashley Maddison's article