getnbiggr: As a gay guy who's 7.5X6.5 and who loves to suck cock, I've been on both sides of this issue. I'm not exactly particularly long, but my girth can give guys a moment of pause. And I find the same thing with the guys I play with and suck...
I did have an interesting experience recently though that I thought might be germane to this conversation. I wound up playing with two differently-sized guys in fairly short succession (in the space of a week) and had radically different experiences with them, though not in the way you'd expect.
One guy was probably about 8" and not unusually thick, and the other about 11x7... And I had much more difficulty/unpleasantness blowing the 8" guy than than with Mr 11".
The former guy kept trying to fuck my throat hard with big thrusting movements, and that was setting off my gag reflex in a BIG way. It hurt and I wasn't having much fun at all...
But Mr 11" was a much better lover (or, to be fair to mr 8", maybe mr 11" was just more suited to my preferences/abilities) and he let me set the pace, so I was **eventually** able to deepthroat him after quite a bit of time and persistance... I fucking LOVED having him stretch out my throat and go down so deep. And it didn't hurt that I actually really liked Mr 11" and really WANTED to take him all down, whereas mr 8" was more of a trick/pick-up that started to go sour pretty quickly.
Anyways, just wanted to comment that there's a lot more than sheer physical dimensions at play when it comes to being able to deepthroat a big cock.
- J