Me and my boyfriend has been having sex for a while now, and I've never really thought about this until a friend of mine suggested that deep throat gagging could potentially damage my windpipe. I'm worried that I may develop a respiratory problems.
The girth of the penis is what would be potentially harmful in stretching your esophagus so much that it would damage by rupturing with the repetitive rubbing motion inside. It's pretty darn rare for the average person so I wouldn't worry about that.
If you're too stressed out and not relaxed enough then you absolutely can bruise the back of your throat. Relaxation is a lot when deepthroating. A bruise will heal up and typically doesn't leave any scar tissue behind that would pose to be problematic.
I suppose getting rid of your gag reflex could cause you to be more prone to choking on large food items since you would not have the reflex to pop the item to the front of your mouth before the choking could occur. It isn't terribly dangerous though to not have a gag reflex as an adult. If you haven't experience it yet, the gag reflex eventually DOES go away with fairly frequent deepthroating. A gag reflex is normal and natural and isn't going to harm you any more than a sneeze or a cough.
If you are deep-throating a guy then I suppose you could inhale some of the ejaculatory fluids if his shaft did not go past that part (the entrance to your lungs) of your body. I think if you can deepthroat then you probably have a good grasp on not inhaling the semen if this is the case with your partner. Inhaling a little fluid is no big deal though. How many times have you gotten a little choked while sipping on a drink, right? In any case, you can wisely ask your partner to let you know when he's about to cum so that you're aware you will need to watch your breathing patterns for it.
Other than that, you would probably need to be a famous deep-throating pornstar to get into problems with swallowing large objects. The human body is meant to swallow food and can stretch quite a bit safely. I'd say deepthroating more frequently than once or twice a day might pose to be a little uncomfortable in the beginning but no serious or long-term damage would come of it.
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