My wife can take me balls deep. I am 7.5 long and real close to 6 around (5.75 or a bit more). She has also deepthroated a friend who is 8.5 and really thick (pushing 6.75-7 I would say).
Technique.......don't try and breathe lol......my BF forces his almost 9 incher down my throat....I doubt I could take any larger, not that I would try
i like to lay on the bed/couch on my back with my head tilted back over the side, slides right in that way
I can deep throat 7" but I prefer to work my mouth around the cock more. When I give head i tend to only deep throat towards the end when I know he's going to cum.
I can comfortably deepthroat my 9" boyfriend. I've gone to about 10.5"/11" on a dildo, though it wasn't nearly as thick. Practice makes perfect! Aside from practice, there are ways to make deepthroat easier/more comfortable. First of all, most of it is mental. You can be horny as hell and want nothing more then to take your man to the root, but once his tip hits the back of your throat, your natural body's reaction is to gag and clamp shut. I found that the hardest part to overcome personally. If you can get over that, the rest is easy. Try "yawning" when you're attempting to throat him. It loosens up the throat muscles and helps negate the gag reflex. Position is also key. Obviously you want your throat to be as in line with your mouth as possible, so lying on your back with your head hanging off the couch or bed is ideal. I find it easier when i'm in a 69 position with me on top, or beside him with my legs towards his head. If you're attempting it from below him, try to keep his dick pointed at an angle down toward you, ideally around 45 degrees (tip I learned from porn!). If all that fails, there are also head cleaners and sprays that can help.
No way can I deepthroat. Give me a guy under 6 inches and all is good. Bigger than that and I'll have my hand at the base to block it. It seems I have this "need to breathe" thing going on. Give me the shorter guys.
OK, I practiced sucking a ratchet tool handle, it is exactly 7 inches long, the handle part, and I gradually got to the point that I can hold in down my throat with no gagging, so then I sucked a couple of guys cocks that were around that size and they both said I was the best cocksucker they ever had! Suppress the gag reflex, it takes time to do that. I have never tried a larger cock and doubt I could handle it at this point.
I can take them balls deep. One thing to keep in mind is the angle that you approach it if your chin is bent down towards your chest you can't take it as deep as if you you looking up. And yes you will have to time your breathing.