Deep throating is not all that common an occurance,sorry guys,hate to ruin the fantasy. The guy would have to be on the below averge length,in most cases,or bigger ,wih the girl being quite experienced.Getting the whole thing in your mouth is not that easy to do.It's fun,but not easy.That being said,when I have been able to do it, and the guy ejaculates,it doesn't add any extra sensory pleasure,but the simple act, or the visual may be erotic enough to heighten the moment. It's more for the guys benefit,than anything else. Experiment with some tapioca pudding and see for yourself,ha,ha!
one of two things could happen if a guy cums while a girl is deep throating
1. a girl can choke because its something that would need to be swallowed and since it's just shooting to the back of the throat without much warning, it's going to be inhaled and not a pretty sight I would think, and inhaling come I don't think would be pleasurable to the girl
2. a girl could throw up all over you. girls gag already from deep throating alone so once again, shooting a load to the back of the throat with out much warning could cause a girls gag reflex to really come into action causing her to puke up all over you. and that's just gross if that were to happen. and probably not much of a turn on for the both of you either.
so if you're asking if it's a turn off or turn on, to me with those answers, turn off. I don't want to have a huge choking fit from your cum, that's so not sexy and will destroy the mood and I don't want to throw up all over you, that would be gross for both of us to see after something as awesome as a blow job.
ehhh it can go down the wrong pipe and you can choke coughing...can ruin the moment =/ I don't mind blowjobs but deep throating is definitely not something every grl is good at sometimes I can't even get the back of my teeth while brushing my teeth with toothbrush my throat is just sensitive