Sometimes it depends... Such as the cock is particularly thick therefore not going to get past the back of the mouth & down the throat so it's just hammering against that glottis or whatever that thing is called. Other times, when it does fit, you have to get it across to the "driver" that you need to breathe occasionally. *ahem*
Personally, I love getting my face fucked! I'll slam my own head down on your cock! Guess I'm a glutton for punishment. lol
Face Fuckers, Gag Factor, Throat Gaggers, Slap Happy... Just some food for thought.
Have fun out there!
XOXOX
Kat