i'm with donkey puncher here.
also, the wider your cock is, the less likely it's going to happen.
2 lasses i've been with have claimed to be able to deep throat other chaps, but unfortunately, not me.
2 have been able to take me into the top of their throat, like mr donkeypuncher says, the turning sensation, and the differences in temperature, etc, are fantastic.
1, very special, glorious, spectacularly kinky lady forced my member down her throat, and she did _force_ it down... it was like a point of personal honour for her...
Heavenly.
Though, as mr donkey puncher said again, the best head i've ever had hasn't involved the throat, well, not much.